Untameable look : This look is not known from a tameable creature.
Forsaken hunters automatically know how to tame undead creatures. Hunters of other races must learn the skill from a Simple Tome of Bone-Binding which is a rare drop from miscellaneous Elite NPCs throughout Maldraxxus and its associated dungeons: Plaguefall and the Theater of Pain.
This rare gloomcharger follows a path through the Maw. It spawns in the Crucible of the Damned and from there it runs past Perdition Hold, through the southern range of The Beastwarrens, and despawns at the southern entrance to Korthia.
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.