NPCs composing that spawngroup :

greater_barbed_skeleton (50%)

plaguebone_skeleton (50%)

NPCs spawning around that spawngroup :
(Max range : 100)

Phurzikon_189466, range=70 (-469,-2546,-361)

a_forest_giant_ancient (10%)
a_forest_giant_verdant (10%)
a_moldering_gorilla (10%)
a_Sarnak_zealot (10%)
a_scoriae_hornet (10%)
a_tatterback_gorilla (10%)
greater_war_boned_skeleton (10%)
Nezekezena (10%)
Phurzikon (10%)
wurm (10%)