Vo'treus the Keyguard

Vo'treus the Keyguard is a boneguard that spawns atop the apex of the Zerekriss in Maldraxxus after the player interacts with the Runic Keyhole during [60] Keys to the Ruin.

Abilities

Bone Armor — Encases the caster in bone armor, absorbing damage for 1 min.
Bone Spikes — The caster periodically summons spikes of bone, stunning enemies.
Bonestorm — Whirl a storm of bones around the caster, inflicting Physical damage to enemies.
Frost Strike — Reduces the movement speed of the target by 50% for 12 sec. Inflicts Physical damage to an enemy.