Appears during the instanced quest, The Final Beacon, which is part of the 'Reforging the Tyr's Guard' quest chain in the Dragon Isles. Classed as an Aberration.
Level scaling: Most NPCs will scale with the Hunter's level, within the constraints of their level range. Hunters can tame regular NPCs up to 2 levels higher than them, but can only tame elite NPCs of the hunter's level or below.