In Zeixshi-Kar's Awakening: known spawn location is at -2100, 3465, 154 (southwest corner inside the giant fort) and -2043, 3182, 174 (SE corner). PH is "a frost giant captain".
Also drops a mask with all negative stats. It can evolve and in the end has -1200 HP/Mana/End including all other stats (will post those numbers later).