NPCs composing that spawngroup :

guano_harvester (10%)

sonic_bat (30%)

sonic_bat (30%)

sonic_bat (30%)

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

soldungb_31, range=180 (-698,-237,-68)

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

soldungb_28, range=157 (-677,-218,-81)

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

soldungb_16, range=184 (-603,-240,-79)

soldungb_15, range=130 (-595,-179,-90)

soldungb_12, range=183 (-498,-162,-103)

greater_kobold (50%)
greater_kobold_shaman (50%)

soldungb_11, range=140 (-551,-159,-93)

greater_kobold (50%)
greater_kobold (50%)

soldungb_10, range=105 (-557,-108,-90)

soldungb_7, range=176 (-581,-224,-73)

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

soldungb_47, range=59 (-595,-46,-107)

sonic_bat (50%)
sonic_bat (50%)

soldungb_48, range=82 (-706,-124,-78)

soldungb_49, range=71 (-594,-103,-98)

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

soldungb_50, range=50 (-696,-87,-100)

sonic_bat (50%)
sonic_bat (50%)

soldungb_51, range=118 (-726,-155,-91)

lava_beetle (100%)

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

soldungb_53, range=176 (-751,-208,-68)

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

soldungb_56, range=95 (-569,-110,-90)

soldungb_74, range=197 (-804,64,-104)

imp_protector (100%)

soldungb_75, range=140 (-683,75,-83)

soldungb_76, range=196 (-668,134,-83)

soldungb_77, range=176 (-651,114,-83)

soldungb_82, range=48 (-688,-30,-105)

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