NPCs composing that spawngroup :

an_elemental_capturer (50%)

NPCs spawning around that spawngroup :
(Max range : 200)

hole_21, range=47 (365,513,-640)

hole_24, range=93 (333,475,-639)

hole_32, range=153 (307,421,-331)

hole_123, range=186 (349,374,-345)

hole_127, range=187 (250,420,-332)

hole_173, range=162 (245,461,-332)

hole_191, range=142 (291,443,-332)

hole_193, range=180 (195,581,-347)

hole_209, range=179 (196,581,-399)

hole_213, range=130 (258,499,-332)

hole_214, range=98 (308,487,-332)

hole_215, range=96 (335,471,-332)

hole_216, range=143 (318,427,-332)

hole_230, range=153 (520,514,-682)

a_flighty_fiend_189562, range=133 (292,455,-332)

a_flighty_fiend_189563, range=23 (358,543,-640)

a_rock_golem_189638, range=165 (245,456,-332)

a_rock_golem_189640, range=173 (252,436,-332)

a_rock_golem_189641, range=79 (321,501,-332)