This mob exists in PoP on TLP servers. Still has to be triggered by killing all 4 MoTM mobs. (MOTM5)
Lots of HP. Ramps more frequently as his health drops. It may only activate after a certain % of health - seemed like 40%.
Dropped a Glyphed Rune Word, Spectral Parchment, Sphere of Encased Flame, and Basalt Greatsword of the Protector.