NPCs composing that spawngroup :

sonic_bat (50%)

sonic_bat (50%)

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

soldungb-Overseer_of_Air00, range=51 (-652,-62,-105)

soldungb_31, range=150 (-698,-237,-68)

sonic_bat (25%)
sonic_bat (25%)
sonic_bat (25%)
sonic_bat (25%)

soldungb_30, range=162 (-762,-237,-75)

lava_duct_crawler (50%)
noxious_spider (50%)

soldungb_28, range=132 (-677,-218,-81)

sonic_bat (50%)
sonic_bat (50%)
sonic_bat (50%)
sonic_bat (50%)

soldungb_16, range=179 (-603,-240,-79)

soldungb_15, range=136 (-595,-179,-90)

soldungb_13, range=191 (-647,-272,-81)

soldungb_11, range=161 (-551,-159,-93)

greater_kobold (50%)
greater_kobold (50%)

soldungb_10, range=140 (-557,-108,-90)

soldungb_7, range=178 (-581,-224,-73)

soldungb_46, range=47 (-714,-131,-92)

soldungb_47, range=109 (-595,-46,-107)

sonic_bat (50%)
sonic_bat (50%)

soldungb_48, range=38 (-706,-124,-78)

soldungb_49, range=103 (-594,-103,-98)

sonic_bat (33%)
sonic_bat (33%)
sonic_bat (34%)

soldungb_51, range=73 (-726,-155,-91)

lava_beetle (100%)

soldungb_52, range=55 (-712,-140,-78)

soldungb_53, range=132 (-751,-208,-68)

sonic_bat (33%)
sonic_bat (33%)
sonic_bat (34%)

soldungb_56, range=129 (-569,-110,-90)

soldungb_74, range=185 (-804,64,-104)

imp_protector (100%)

soldungb_75, range=162 (-683,75,-83)

soldungb_78, range=192 (-811,67,-104)

soldungb_79, range=193 (-791,82,-104)

soldungb_82, range=57 (-688,-30,-105)

sonic_bat (33%)
sonic_bat (33%)
sonic_bat (34%)