NPCs composing that spawngroup :

an_elemental_visier (25%)

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

hole_32, range=61 (222,-3,-345)

hole_34, range=33 (231,91,-327)

hole_70, range=43 (191,91,-327)

hole_73, range=66 (156,47,-347)

hole_93, range=51 (256,21,-346)

hole_94, range=16 (208,49,-342)

hole_96, range=41 (210,18,-342)

hole_97, range=12 (209,60,-346)

hole_98, range=0 (221,59,-346)

hole_103, range=90 (169,-15,-346)

hole_171, range=69 (158,89,-330)

hole_172, range=78 (146,36,-333)

a_rock_golem_189630, range=73 (149,76,-333)

va_hole_73, range=66 (156,47,-347)

va_hole_93, range=51 (256,21,-346)

va_hole_94, range=16 (208,49,-342)

va_hole_96, range=41 (210,18,-342)

va_hole_97, range=12 (209,60,-346)

va_hole_103, range=90 (169,-15,-346)

va_hole_171, range=69 (158,89,-330)

va_a_rock_golem_189630, range=81 (141,76,-328)