NPCs composing that spawngroup :

fire_giant_wizard (100%)

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

soldungb_3, range=29 (-1110,-293,-43)

fire_giant_warrior (50%)
fire_giant_warrior (50%)

soldungb_34, range=195 (-1237,-472,25)

soldungb_41, range=23 (-1110,-345,-43)

soldungb_61, range=136 (-976,-337,-57)

lava_duct_crawler (100%)
lava_duct_crawler (100%)

soldungb_62, range=177 (-940,-279,-83)

lava_duct_crawler (50%)
lava_duct_crawler (50%)

soldungb_63, range=111 (-1002,-346,-83)

lava_duct_crawler (50%)
stone_spider (50%)

soldungb_64, range=150 (-1009,-433,-18)

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

soldungb_65, range=148 (-968,-282,-83)

lava_duct_crawler (50%)
lava_duct_crawler (50%)

soldungb_83, range=170 (-1071,-488,-7)

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