Fracture has a chance to spawn after spending at least 15 minutes in this instanced zone (appears as a roamer with a path west of the crystal core).
It is a Wizard and casts regular Wizard spells (in addition to its NPC abilities listed below). It hits for a max ~7,000; is snareable/rootable; summons; and casts two spells:
When it reaches 50% health, it splits into two mobs (of the same name). Then those two mobs split into an additional two mobs each when they reach 50% health. The split versions don't hit as hard as the original version.