NPCs composing that spawngroup :

an_elemental_wizard (20%)

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

hole_25, range=34 (92,77,-346)

hole_32, range=26 (133,42,-346)

hole_33, range=72 (63,104,-347)

hole_65, range=83 (31,80,-346)

hole_66, range=89 (18,38,-346)

hole_70, range=95 (191,91,-327)

hole_73, range=49 (156,47,-347)

hole_97, range=12 (114,36,-333)

hole_103, range=86 (169,-15,-346)

hole_130, range=0 (107,46,-347)

hole_160, range=78 (35,78,-333)

hole_171, range=66 (158,89,-330)

hole_172, range=40 (146,36,-333)

hole_218, range=83 (24,40,-333)

hole_220, range=82 (27,64,-370)

a_rock_golem_189630, range=51 (149,76,-333)

va_hole_25, range=34 (92,77,-346)

va_hole_66, range=89 (18,38,-346)

va_hole_73, range=49 (156,47,-347)

va_hole_97, range=12 (114,36,-333)

va_hole_103, range=86 (169,-15,-346)

va_hole_171, range=66 (158,89,-330)

va_hole_218, range=83 (24,40,-333)

va_a_rock_golem_189630, range=45 (141,76,-328)