"We are the chosen, destined to receive the gifts of the Watchers. Our faith is tested by bitter cold and endless winter. A crucible that separates the worthy from the unworthy, purging doubt, and leaving purity behind. The others fight like neglected children, petty squabbles that will amount to nothing in the end. We have purpose: to prepare this land for new masters. The Watchers return. Our ascendance is at hand."
The Frostguard dwell hidden beneath an eternal winter, deep in the ruins of the ancient Freljord. They live among the ancient ruins to the far north, protecting their leader Lissandra as she watches over the Howling Abyss. A cult shrouded in secrecy, the Frostguard archive of all Freljords archaic history. Though seemingly peaceful, the truth of the Frostguard's allegiance is far more disturbed. The world had forgotten the terrible enemy that ruled the Freljord long ago and was cast into the depths of the Howling Abyss following a long and brutal battle. And now, whilst the ignorant sleep, Lissandra keeps the Watchers at bay and plots to rule over all of Runeterra. Even so, missionaries and healers from the cult are common throughout the Freljord. The trolls and their king, Trundle, have allied themselves with Lissandra, while Nunu temporarily lived among the Frostguard.
There are several other tribes who were absorbed or allied with the Frostguard:
Black-Clads: A order of priests and shaman, often assigned to regional villages as sources of social and religious authority.
Chosen Children: Their warchief was Helmgar Cragheart before being killed by Sigvar Half-Quiver. Current state unknown, presumably decimated.
Draklorn: As the highest tier of the priesthood—answering only to the Ice Witch herself—Draklorn are among the most zealous and learned of all Frostguard. Some of them rarely set foot outside the Citadel's walls, and they are no doubt privy to secrets that would never be entrusted to the lower ranks.
Warriors of the Keeper's Lodge: These warriors diligently patrol the locations of some of the largest known Watchers in the Howling Abyss, or at least those closest to the icy surface. This particular beast is known as “the Pierce-Eye”, ever since it was skewered with titanic Mortis Stones dropped from the fortress high above.
The Cult of The Three Sisters, Lissandra's proliferated religion which promotes the worship of Avarosa, Serylda and Lissandra, is the main religion of the Frostguard. They have been trying to maintain the religious dominance of it over the Freljord by installing Frost Priests, who are healers, on different tribes as surveillance tools. Due to Lissandra's history with the old demi-gods, they also sabotage the worship of old demigods and destroy evidence of their existence to deny them power and influence and so far have succeeded to some degree.