NPCs composing that spawngroup :

a_flighty_fiend (50%)

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

hole_21, range=30 (365,513,-640)

a_rock_golem (50%)

hole_24, range=71 (333,475,-639)

a_rock_golem (50%)

hole_214, range=75 (308,487,-332)

hole_215, range=75 (335,471,-332)

a_wanderer (50%)

Stonesoul_the_Unmovi_189535, range=90 (279,499,-330)

an_elemental_harvester (50%)
Stonesoul_the_Unmoving (50%)

an_elemental_capture_189550, range=23 (374,560,-640)

an_elemental_capturer (50%)
Rocksoul (50%)

an_elemental_wizard_189572, range=43 (352,585,-638)

an_elemental_wizard (50%)
bejeweled_elemental (50%)

a_rock_golem_189641, range=55 (321,501,-332)

a_rock_golem (50%)