NPCs composing that spawngroup :

sonic_bat (25%)

sonic_bat (25%)

sonic_bat (25%)

sonic_bat (25%)

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

soldungb-Overseer_of_Air00, range=181 (-652,-62,-105)

soldungb_30, range=63 (-762,-237,-75)

lava_duct_crawler (50%)
noxious_spider (50%)

soldungb_28, range=29 (-677,-218,-81)

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

soldungb_27, range=137 (-590,-322,-71)

soldungb_26, range=129 (-587,-303,-69)

soldungb_25, range=194 (-506,-270,-75)

soldungb_24, range=79 (-656,-305,-66)

soldungb_23, range=119 (-625,-331,-65)

Solusek_kobold (50%)
Solusek_kobold_shaman (50%)

soldungb_22, range=132 (-638,-355,-65)

a_kobold_advisor (100%)

soldungb_21, range=117 (-652,-345,-66)

soldungb_20, range=113 (-595,-286,-69)

Solusek_kobold (100%)

soldungb_19, range=197 (-533,-345,-60)

soldungb_18, range=194 (-549,-362,-60)

soldungb_17, range=170 (-553,-327,-60)

greater_kobold (50%)
Solusek_kobold (50%)

soldungb_16, range=95 (-603,-240,-79)

soldungb_15, range=118 (-595,-179,-90)

soldungb_13, range=61 (-647,-272,-81)

soldungb_11, range=166 (-551,-159,-93)

greater_kobold (50%)
greater_kobold (50%)

soldungb_10, range=191 (-557,-108,-90)

soldungb_7, range=117 (-581,-224,-73)

soldungb_46, range=107 (-714,-131,-92)

soldungb_48, range=113 (-706,-124,-78)

soldungb_49, range=169 (-594,-103,-98)

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

soldungb_50, range=150 (-696,-87,-100)

sonic_bat (50%)
sonic_bat (50%)

soldungb_51, range=86 (-726,-155,-91)

lava_beetle (100%)

soldungb_52, range=98 (-712,-140,-78)

soldungb_53, range=60 (-751,-208,-68)

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

soldungb_56, range=181 (-569,-110,-90)

soldungb_65, range=199 (-895,-205,-78)

lava_duct_crawler (50%)
lava_duct_crawler (50%)

soldungb_68, range=190 (-877,-173,-79)

soldungb_89, range=163 (-538,-270,-70)

a_kobold_guardian (100%)