Champions hit with the seconday bolts will trigger minion agro.
Secondary bolt critical strikes are dependent on the triggering attack; if the triggering attack critically strikes, so will the secondary bolts. Likewise, the secondary bolts will not critically strike if the triggering attack does not critically strike.
The movement speed stat only increases flat movement speed, and will not interact with other percentage increases.
While in possession of Runaan's Hurricane, you gain a small floating orb that accompanies you around the battlefield. This orb fires up to two additional missiles, functioning similar to Lulu'sPix, Faerie Companion.
Bolts from Runaan's Hurricane will not increase the frequency of Guinsoo's Rageblade'sPhantom Hit even when hitting 2 additional targets because Phantom Hit is triggered with On-Action Effects (not with On-Hit ones) and the bolts hitting 2 additional targets still counts as only one On-Action Effect.
The passive will be triggered by the auto-attacks of any champions classified as ranged. This is an attribute applied to champions that is independent of in-game context, such as proximity to the target or a specific champion's attack animation.
Shapeshifting champions will trigger the effect while in ranged form only, as they are classified as melee while in melee form and the orb disappears returning when they switch again.
Rengar'sUnseen Predator will not trigger the effect despite his autoattacks having 600/750 range, as Rengar is classified as melee.
Kayle will trigger the effect when Arisen, but not before.
Azir will trigger the effect on both his standard attacks and his command soldier attacks, permitted his target is within his personal attack range (i.e. the item will not trigger while attacking targets using his soldier's extended range).
For effects such as Azir's soldier attacks and Twitch during Spray and Pray, the Runaan Bolts will remain single-targeted. The bolts can potentially damage targets already damaged by the abilities.
Although Gnar is officially melee, and simply is given some extra range by his passive, Hurricane works when he is in Mini Gnar mode, and Ravenous Hydra works while he's Mega Gnar.
The item not only has a maximum range on its bolts from the main target, but also one centering on your champion. (specific ranges PENDING FOR TEST)
Runaan's Hurricane can be affected by blind, as such the secondary bolts will also deal no damage.
This item's damage scales with your attack damage and not the damage dealt by your attack. As such, it will not scale with Sheen, Spinning Axe, or other on-action effects.
It will apply life steal and most on-hit effects from items. The effect does not apply on on-hit effects from abilities which apply on-hit effects. 'On-next-attack' effects will only be applied to the primary target.
The following items also apply to secondary targets:
Wit's End (each bolt shreds 3 magic resist, while the user gains 3 magic resist for every bolt that hits a target)
The procs from Statikk Shiv and Rapid Firecannon don't affect the secondary targets, so no triple Statikk Shiv / Rapid Firecannon procs via Hurricane. The increased attack range from Rapid Firecannon however also affects secondary Hurricane targets, so if you have both Hurricane and Rapid Firecannon all 3 attacks will have slightly longer range from time to time.
The following abilities also apply to secondary targets:[3]
Kayle'sStarfire Spellblade (before becoming Arisen, it only works beyond 175 range, as below this the attack is considered melee and will instead trigger effects such as Cleave)
Vayne'sSilver Bolts will only apply to the primary target. This is to prevent disabling the skill, as bolt stacks can only be applied to a single target at any given time.
Miscellaneous effects that also apply to secondary targets:
Twitch will still trigger the effect while Spray and Pray is active. The two missiles fired are unaffected by the ability, and remain single target, targeted missiles. As such, it is possible for an enemy to be damaged by both Twitch's pass-through attacks and this item while gaining two stacks of Deadly Venom.
Secondary bolts will not interact in anyway with Guinsoo's Rageblade i.e. it does not stack faster and the on hit damage is not applied (PENDING FOR TEST)
Compared to the other items building out of Zeal, Runaan's Hurricane offers 3 assets over its siblings:
Improved teamfight damage. 40% per target might not sound like much, but it adds up. Especially when having utility like slows or on-hit effects coupled to your auto-attacks, this item's impact is not to be underestimated.
Improved lifesteal. By effectively increasing your attack damage by 80%, your lifesteal is improved as well. As a result, you can heal up faster on minion waves or monsters and are less prone to Thornmail's reflected damage.
Improved waveclear. While falling short to Statikk Shiv's strong waveclear potential, it still speeds up your waveclear. However, this might very well be an undesired side effect when buying this item, as it makes freezing waves impossible. This is not a problem after the early game, since freezing at this point is less powerful and you want to push and take out towers as fast as possible.
For those three reasons, Runnan's Hurricane is one of the most, if not the most commonly purchased attack speed/crit chance item.
There are still, however, some crit-focused champions which do not purchase it. For example, champions which do not have synergy with its passive (e.g. Vayne, Draven), champions which are focused on casting abilities instead of constantly auto-attacking (e.g. Jhin, Ezreal), or champions which cannot purchase Runaan's Hurricane at all (e.g. Tryndamere, Yasuo, Master Yi).
Some on-hit ranged champions like Kayle and Kog'Maw purchase it because it allows them to apply their on-hit effects to more than one target, even if they are not going to purchase other crit items.
Jinx'sSwitcheroo! has powerful synergy with the Hurricane. Pow-Pow gains a stack of the attack speed buff for each bolt that hits, and Fishbones' splash damage will stack on all enemies for all three projectiles. If enemies are bunched up, a few well-placed rockets can devastate them.
Trivia
Runaan's Hurricane is named after Devon 'Runaan' Giehl, an Associate Creative Designer at Riot Games.
The orb that fires the 2 bolts and floats around the champion it's equipped to is most likely a reference to a similar power up in the Gradius games.
The item may have been inspired by the alpha itemHurricane, which was also a bow, though Hurricane's Alpha effect is unknown.
Unique passive - Wind's Fury: When basic attacking, bolts are fired at up to 2 enemies near the target, each dealing 25% AD physical damage. Bolts can critically strike and apply on-hit effects.
2600 (
Zeal, 
Runaan's Hurricane offers 3 assets over its siblings:
Vayne, 
Draven), champions which are focused on casting abilities instead of constantly auto-attacking (e.g. 
Jhin, 
Ezreal), or champions which cannot purchase Runaan's Hurricane at all (e.g. 
Tryndamere, 
Yasuo, 
Master Yi).
Kayle and 
Kog'Maw purchase it because it allows them to apply their on-hit effects to more than one target, even if they are not going to purchase other crit items.
Jinx's 
Switcheroo! has powerful synergy with the Hurricane. 
Pow-Pow gains a stack of the attack speed buff for each bolt that hits, and 
So the extra attacks will hit the two nearest enemies within 300 range of your Auto-Attack target?
