NPCs composing that spawngroup :

lava_beetle (33%)

lava_beetle (33%)

lava_beetle (34%)

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

soldungb-Overseer_of_Air00, range=82 (-652,-62,-105)

soldungb_31, range=113 (-698,-237,-68)

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

soldungb_30, range=125 (-762,-237,-75)

lava_duct_crawler (50%)
noxious_spider (50%)

soldungb_28, range=98 (-677,-218,-81)

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

soldungb_24, range=187 (-656,-305,-66)

soldungb_20, range=195 (-595,-286,-69)

Solusek_kobold (100%)

soldungb_16, range=155 (-603,-240,-79)

soldungb_15, range=123 (-595,-179,-90)

soldungb_13, range=159 (-647,-272,-81)

soldungb_11, range=158 (-551,-159,-93)

greater_kobold (50%)
greater_kobold (50%)

soldungb_10, range=149 (-557,-108,-90)

soldungb_7, range=160 (-581,-224,-73)

soldungb_46, range=10 (-714,-131,-92)

soldungb_47, range=135 (-595,-46,-107)

sonic_bat (50%)
sonic_bat (50%)

soldungb_49, range=113 (-594,-103,-98)

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

soldungb_50, range=38 (-696,-87,-100)

sonic_bat (50%)
sonic_bat (50%)

soldungb_51, range=36 (-726,-155,-91)

lava_beetle (100%)

soldungb_52, range=17 (-712,-140,-78)

soldungb_53, range=95 (-751,-208,-68)

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

soldungb_56, range=137 (-569,-110,-90)

soldungb_68, range=177 (-877,-173,-79)

soldungb_82, range=95 (-688,-30,-105)

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