Bosses
Beast in the Ice
Initiate boss in the Fractured Peaks. Hoard opens with a Lair Key.
Where and how
Its lair is the Glacial Fissure, south of Kyovashad in the Fractured Peaks. The hoard takes one Lair Key, and killing it also gives a Greater Lair Key.
Unique pool
Mythic drops from this hoard come from this pool. See Lair bosses for how mythics work.
Vox Omnium (Sorcerer) can drop here or from Varshan.