3 Buhru Sentinel who introduces them to the Worldstone and the Wayfinder, tools that allow them to teleport to any Sentinel base. They are tasked with fighting back the Mist across Runeterra and recruiting any worthy fighters to their cause. Understanding their mission, they head out to fight the Black Mist, starting in Demacia.
and sail to Sentinel Headquarters in search of reinforcements. There they encounter a lone Sentinel rookie before being attacked by wraiths. The Sentinels discover a mysterious girl, , fighting off wraiths with a pair of oversized scissors. When more wraiths arrive, she hides everyone within a cloud of Hallowed Mist, allowing them to retreat to the base. Inside, the Sentinels are contacted by a
Once they arrive in Demacia, currently under siege from a massive Harrowing, the Sentinels head to the Singing Swan tavern to gather information. There they meet
, who informs them the Harrowing is concentrated around the Mageseeker compound. With the knowledge that is seeking a powerful artifact, they head out to face the Ruined King. A ruined confronts them at the entrance of the compound and buries them in rubble. Gwen frees the group with her scissors and they charge into the mageseekers' vaults.
Viego confronts the Sentinels within the vaults and opens a sealed chest to retrieve a handheld mirror, revealed to be a fragment of Queen
's soul. He attempts to retrieve the remaining fragment within Senna, but Gwen intervenes and hides her within Hallowed Mist. Viego vanishes, but not before collapsing the building atop the Sentinels. The Sentinels manage to escape and give chase to Viego.
The group manages to corner him, but before they can harm him, attacks. At Vayne's provocation, Shyvana transforms, and the Sentinels are forced to fight her in her draconic form. Viego escapes with the mirror while the Sentinels subdue Shyvana. Senna stops Vayne from killing her and they agree to imprison her within the Mageseeker's dungeon until she returns to normal. Vayne agrees to join the Sentinels, in exchange for relic weapons, and they return to headquarters to swear her in. Once sworn in, Gwen outfits with a new uniform and a relic crossbow.
In the Shadow Isles, Viego revels in his victory.
offers his services to Viego, but he rejects him, no longer trusting Thresh after Senna escaped his lantern. Viego's newest ally, , has returned from spreading the Black Mist across Runeterra and is eager to see the world plunged into darkness. Elsewhere on the Isles, Thresh begins to absorb the Black Mist and plots his next move.
The Sentinels teleport to the Freljord base, only to be trapped beneath decades of packed snow. Digging their way out of a snowdrift, the Sentinels discover a giant, axe-wielding berserker battling some wraiths. Harrowing and they follow him as he hacks his way through the snowdrift to chase after a wraith. The wraith leads him to , a depressed yordle working with Viego, and Olaf attacks her. She easily repels his charge and prepares to finish him off. The Sentinels intervene before Vex can deliver the finishing blow and she leaves with her Shadow. Olaf is displeased with their interference in his warrior's death and demands a fight.
recognizes from an earlier
The Rookie has a close call with Olaf's blade, but eventually manages to placate him. Olaf agrees to team up with the Sentinels to fight Vex and guides them through the Freljord. The group then sets off through some ice caves in search of Vex. After several hours, the Sentinels reach the top of a glacier and encounter Vex unearthing an artifact from the ice. The Sentinels confront her, but make little headway against her Shadow. Olaf, pacified by the Rookie, can't enter his berserk state to help the group. The Sentinels manage to enrage Olaf again and direct his fury against Vex. Nonetheless, she secures the artifact, an ivory comb, and escapes.
The Sentinels chase Vex down the glacier and cause an avalanche to cut off her escape. As they corner her, she slows them down with a cloud of despair and disappears. Lucian suggests recruiting Olaf, which Senna reluctantly agrees to, and they convince him to join with the promise of facing with a new uniform and relic axes.
, someone who could grant him a warrior's death, and they return to headquarters. Senna swears him into their ranks and Gwen provides
In Noxus, the Sentinels discover that their base has been paved over by the Reckoner's Arena, where gladiators are fighting wraiths.
presides over the ruined crowd and, after spotting the Sentinels, decides to make them his next combatants and unleashes a horde of wraiths against them. Though the Sentinels triumph, they are imprisoned until their next fight. While in their cell, they meet , who has devised an escape plan that requires the Rookie's silver tongue. They manage to lure a guard to their cells, before ambushing them and stealing their keys. The group then fights their way through the remaining guards and reclaim their weapons.
Once free, Riven and the Sentinels follow the Black Mist to the Immortal Bastion. They find wraiths pouring into a statue of an arrives, demanding the three finish their fight.
and discover an entrance to the city's catacombs hidden behind the monument. Senna, Riven, and the Rookie descend in search of the secrets the Mist seeks out, while the others guard their escape. They eventually arrive at the Black Rose's chamber and enter after the Rookie shares one of their darkest secrets. Inside the chamber, Senna, Riven and Rookie confront Viego. The Ruined King has already found another fetter, a wine flagon, and taunts Senna about the one she still possesses. Before they can stop him, Viego vanishes and
Draven forces Senna, Riven, and the Rookie to return to the arena and battle him, revealing that he has recaptured their allies. After a struggle, the three exploit Draven's pandering to the crowd and gain the upper hand. They leave him hogtied in the arena and reunite with the rest of their party. As the Sentinels prepare to depart, they notice Riven sitting alone and offer to let her join them with the promise of giving her a new home. They return to headquarters where is sworn in and Gwen outfits her with a new uniform and a relic sword.
In Ionia, the Sentinels are met by the ruined landscape of the First Lands and are attacked by the corrupted environment. After fighting off the Mist, the Sentinels are confronted by can mean well for Ionia, she agrees to take them to and the Lasting Altar.
, who mistakes them for enemies. While Irelia initially refuses to believe any group containing
At the Altar, Riven and remain outside, while the rest of the group heads in. Karma reveals that Viego is coming for another fetter, a silver flower. She charges the Sentinels with taking the fetter to the Grove of the Ancients, a vastayan forest protected by ancient magic that not even the Black Mist can penetrate. Before they can leave, wraiths invade the Altar and the Sentinels and Irelia hold them off while Karma flees to the grove.
As the Sentinels escort Karma to the forest, she is overwhelmed with regret of not intervening as Ionians died during the Noxian invasion. Giving in to Viego's corruption, persuaded by his determination and decisiveness, she becomes and flees into the forest with the fetter. The Sentinels track Karma down and manage to temporarily purify her and reclaim the fetter. Before transforming back, she explains each fetter is part of Isolde's soul and Viego is determined to combine them to bring back his lost love. As more wraiths arrive, the Sentinels abandon Karma and flee into the Grove.
Inside the Grove, the Spirit of Ionia and the Grove's magic shield the Sentinels from their foes. In the lull, Senna and the Sentinels ponder her connection with Isolde. When Viego himself arrives, he corrupts the land and steals the fetter. Seeing Viego corrupt the Spirit of Ionia convinces Irelia to join the Sentinels and she returns to headquarters with them. is sworn into their ranks and Gwen gives her a new uniform and relic blades.
In Targon, the Sentinels see the mountain's peak has been shrouded in Black Mist. The Sentinels, determined to make the perilous climb, encounter
at the base of the mountain, who volunteers to guide them on their climb. Halfway up, Diana suggests retreat when she hears the Aspects locked in a celestial clash. The Rookie convinces her that protecting Targon is worth risking the Aspects' wrath, but before they can continue they encounter Solari fanatics blocking their path.
They quickly dispatch the Solari and continue their climb. Near the peak, the group finds . The newly restored Aspect of War then calls down an avalanche. Sheltering from Pantheon's avalanche in a cave, the group is trapped by falling rocks. Diana despairs and nearly succumbs to ruin, but the group meet two Lunari, who reveal that Diana is the Aspect of the Moon, and whose faith in her restores her will to fight. Reinvigorated, Diana clears the rockfall and they head back up the mountain.
and locked in battle for another fetter. Before they can assist Atreus, Viego ruins him and reawakens
At the peak, cosmic light battles plumes of Black Mist. In the chaos, Viego retrieves another fetter, a copper sundial. As the Sentinels prepare to confront him with the Aspect of the Moon, Viego prompts his own Aspect to dispatch the group and departs. Pantheon knocks them to a lower plateau and summons a wraith army to his aid. After overcoming his army, Diana defeats Pantheon herself and sends him plummeting. Seeing no hope for her people while the Harrowing persists, agrees to join the Sentinels. She returns to headquarters to be sworn in and is given a new uniform and a relic sword by Gwen.
In Piltover, the Sentinels discover that the city is oddly unaffected the Black Mist. They run into
, who informs them that Piltover has hextech contraptions that hold back the Mist. However, the machines soon break and the Black Mist pours in. They track the Mist to a curio shop, where Senna identifies an antique parasol as a fetter. Before the Sentinels can secure it, Graves steals the parasol with the intent of selling it.
Following a trail of Black Mist, the Sentinels discover that Graves has fled to the undercity of Zaun. Unfortunately the entrance to Zaun has been blocked by barricades and chem-tech mines. The group soon meets two local Sentinels, 8 Dess & Ada, who suggest entering the undercity through the cities' connected sewer system. Once they arrive in Zaun, they encounter , who is also searching for Graves' fetter. Dess & Ada hold off Vex, while the rest of the team searches for Graves.
The Sentinels eventually track him down to a chemtech factory, and Senna sends in the Rookie to negotiate. Vayne and Senna soon join the negotiations, but when Graves refuses to hand over the fetter, Vayne shoots at him and he returns fire. The Sentinels find themselves in a gunfight, surrounded by volatile chemicals. Graves' reckless firing soon causes the chemicals to ignite. They all escape as the building blows, but stumble upon Vex, who has defeated Dess & Ada and takes the fetter. The Sentinels reveal that Viego seeks to revive his wife with the fetters, but Vex dismisses them and leaves. Lucian sees value in a fearless gunman who's furious at Viego and recruits Graves, despite protest from Senna. They return to headquarters where outfits himself with a new relic shotgun and uniform. Despite initial objections, Graves eventually takes the Sentinels oath after being intimidated by Vayne, the only Sentinel he respects.
In the Shadow Isles, Viego gazes remorsefully at an ancient music box, longing to be reunited with Isolde. Vex questions if what the Sentinels said was true, that Viego intends to use the fetters to bring back his wife. Viego admits he plans to revive his lost love, which disappoints Vex and she prepares to leave. Not wanting to lose his most powerful ally, Viego promises that he still has plans for her and Vex decides to stay. Nearby, Thresh eavesdrops on the conversation and ponders his own place in his plans.
Arriving in Ixtal, the Sentinels must split up to find traces of the Harrowing. Frustrated by Lucian's growing concern, Senna sends him and the Rookie off to scout the east while the others head in different directions. Lucian and the Rookie soon encounter
, who expresses interest in the challenge of hunting wraiths. Unfortunately he is ill equipped to fight wraiths and is soon overwhelmed, forcing the two Sentinels to rescue him.
Defeated by the wraiths, Rengar loses his confidence and refuses to fight. The Rookie spins a fanciful tale and, despite Lucian's amusement and disbelief, manages to re-inspire Rengar. With their new ally roused, the trio pushes on after the Mist. Lucian vents to Rengar and the Rookie about his desire to protect Senna. with a new uniform and relic knives.
appears and offers a deal to the group: crucial information that can defeat Viego, in exchange for a fetter. Despite their bitter history, Lucian follows him to a temple to hear him out, where Thresh exploits Lucian's desire to protect Senna and makes him retrieve a jade mask from the temple. Thresh illuminates ancient reliefs within the temple that tell the story of an old Harrowing, which reveals that there is a powerful weapon at the Sentinel base in Shurima, a gun that can revive fallen allies. Not believing the story, Lucian calls off the deal, but Thresh has already departed. Furious that they have been tricked, Lucian swears Rengar and the Rookie to secrecy. The Rookie convinces Lucian to let Rengar join them, due to his new desire to hunt Viego and prove that he is still an apex predator. Senna swears him in and Gwen outfits
In the Shadow Isles, Viego observes the fetters that he has collected, before being interrupted by Thresh. Thresh reveals the jade mask and offers it as an olive branch, feigning interest in returning to his good graces. Viego accepts the offering, but warns Thresh about failing him again. As Thresh leaves, he siphons more Black Mist and flesh begins to grow over his bones.
In Bilgewater, the Sentinels find the port city surrounded by a fleet of warships. They notice a trail of Black Mist leading to the cabin of one of the ships and deduce that the commander of blockade has found the fetter. Graves believes his reputation in the city will allow them to negotiate for the fetter and boards the ship with Gwen, Senna, Vayne, and the Rookie. Aboard the vessel, they learn that
is responsible for the blockade, as part of her on-going turf war against . She mistakes Graves and the Sentinels as mercenaries sent by the former Reaver King, but Lucian intervenes and informs her that Viego has returned to Bilgewater. Miss Fortune reveals that she has recently recovered a fetter, a brass bell, and when the Sentinels explain the object's value, she leaves to make a deal with Viego.
The team pursues her, trying to talk her out of the deal, but Fortune insists her power struggle with Gangplank is too important, hoping that she can gain the power to finally bring order to Bilgewater. The Sentinels manage to persuade her to join them, and to give them the fetter if they can defeat Viego; however, they do not entirely trust her. On their way to the slaughter docks, the group comes across betrays the group and offers Viego the fetter and the Sentinels in exchange for the power to destroy her rivals, becoming ruined. Senna proceeds to attack Viego and Fortune returns fire. In the ensuing fight, the Rookie informs Pyke that Miss Fortune is now on his list and he disappears. Viego departs with the fetter, but not before collapsing the warehouse, which knocks the Wayfinder into the ocean.
fighting a group of wraiths. After a tense misunderstanding, Senna convinces him to fight the wraiths barring their path, allowing them to keep tracking Viego. The Sentinels soon find him in a warehouse, searching for the fetter. After confronting him,
Dispirited at the loss of their only transportation, the Sentinels encounter more misfortune when Miss Fortune and her crew shows up to finish them off. At the last moment, Pyke returns and drags Fortune in to the bay, while the Sentinels fight off her gang. After hours of fighting, the Sentinels defeat Fortune's crew, but are pressed to exhaustion. Pyke eventually resurfaces and returns the Wayfinder to the Sentinels before parting ways. The group returns to headquarters, only to find out that Pyke has stowed away. Lucian sees value in an indestructible, homicidal, ghoul and Pyke is convinced that Viego is on his list. Gwen outfits with a new uniform and a relic knife and Lucian swears him, despite objections from Senna.
Looking over her motley crew of Sentinels, Senna knows that time is running out and decides it's time to act. Lucian, afraid of losing her, proposes to the Rookie that they should track down the weapon Thresh told them about. They teleport to Shurima while the others are asleep. At the Shurima base, they meet
, who now possesses the fabled weapon after his mentor, Shadya, was murdered by one of the local warlords. Determined to revive Shadya, Akshan leaves to confront one of the warlords. Lucian and the Rookie track him down and despite expressing their doubts, agree to stand guard and watch to see if the Absolver works.
After killing the warlord, Akshan races back to the base to see if his mentor is revived. When she isn't, Lucian and the Rookie try to convince the rogue Sentinel to give up his resurrection quest and join their cause. Undeterred, Akshan leaves to face another warlord. As Lucian and the Rookie prepare to depart, they see a Harrowing occurring in the village below. Realizing Viego is here searching for another fetter, Lucian decides he and the Rookie must face their foe alone.
In town, Viego, , and have recovered another fetter, a reed basket. Lucian and Rookie charge Viego with guns blazing, but Karma shields him from their attacks. Realizing it's only the two of them, Viego decides to save his strength and departs with his court and the fetter. He summons a horde of wraiths to deal with the interlopers and they quickly overwhelm the Sentinels. As they lay dying, a familiar face returns and dispatches the wraiths. Returned to the Shurima base, Lucian and the Rookie awaken, realizing they were revived by the Absolver. Having a change of heart, Akshan tells them his mentor believed in the Sentinels' cause and that joining them would be a better way of honoring her memory. Returning to headquarters with their new ally, Senna is furious at Lucian and the Rookie's attempt to sneak off to try and find a way to keep her alive, as well as at Akshan for his numerous Sentinel code violations.
At last, the Sentinels head to the Shadow Isles to confront Viego and put an end to his madness. Lucian and Senna fight once more about his inability to let her go, and her determination to stop Viego, no matter the cost. They meet a 4 veteran Sentinel, who informs them that it is impossible for them to head into the heart of the Mist without protection. He takes the group to meet , who offers them the last of the Waters of Life and the final fetter, . The Sentinels sail to Viego's island, but notice Akshan has disappeared. The Sentinels split up and prepare to ambush Viego. Senna draws him out with the remaining fetters and the Sentinels attack, while Gwen tries to restrain him with her needles, thread and Hallowed Mist. As the Sentinels begin to gain the upper hand, Viego reveals that he has corrupted Ada and Dess, the Sentinels of Piltover & Zaun, and they restrain Senna; he then swiftly dispatches Gwen with a strike from his sword. The Sentinels try to free their leader, but , , , , and arrive and attack with an army of wraiths. Viego has create a portal to Camavor and takes Senna, Gwen, the Maiden, and the other fetters through. Lucian almost pursues, but recognizes that Senna needs to finish this herself and returns to the fight.
Before the portal closes, the Rookie reaches it and enters the land of Camavor. Using the fetters, Viego resurrects Isolde, killing Senna, Gwen, and the Maiden in the process. Isolde is horrified at what Viego has become and rejects him. Enraged, Viego attempts to corrupt the Rookie, but is interrupted by Akshan, who sneaked through the portal. Realizing his weapon is ineffective against Viego, Akshan is prompted by Isolde to shoot her instead. He kills Isolde with his Absolver, which revives Senna, Gwen, and the Maiden and weakens Viego. Senna and Akshan attack Viego, while the Rookie tries to distract him. Gwen manages to bind him with her Hallowed Mist and Viego is left defeated and restrained. The remaining fetters reckon with surviving and wonder how they will get back. Vex offers to open a portal back, no longer having an issue with the Sentinels now that Viego is defeated.
Returning to the Shadow Isles, the group is reunited with their allies and see that those who were corrupted have returned to normal. They notice the Isles suspiciously remain plagued by the Black Mist and Rengar warns them of an approaching presence, something more powerful than anything he has sensed before. This turns out to be a newly corporeal
, who reveals that he has been siphoning the excess Mist Viego was wasting, and is now unbound from the Isles. He divulges the bargain that Lucian made with him in Ixtal and demands retribution for Senna's soul escaping his lantern, one soul for hers or all of their souls if no one complies. The Sentinels try to stop him, but Thresh easily repels their attacks. Lucian considers offering his soul, but the Rookie takes his place instead. As Thresh prepares to harvest their soul, the Rookie activates the Wayfinder at the last second and transports everyone back to headquarters. With Viego defeated, most of the new Sentinels return to their old lives and Akshan heads back to Shurima to honor his mentor and continue her work. Vayne decides to remain with the Sentinels and agrees to represent them in Demacia, while Lucian, Senna, and Gwen begin a new quest to stop Thresh. Nearby, Thresh is eager to harvest more souls, free from the Shadow Isles.
Starting on Week 3 (July 22nd), a new mission was added. This mission could be repeated infinitely. It didn't appear in missions log. Completing it granted 600 Sentinel points.