NPCs composing that spawngroup :

a_preying_lavaspinner (50%)

NPCs spawning around that spawngroup :
(Max range : 100)

delvea3410178, range=52 (-1520,-1481,-103)

unhatched_lavaspinner_eggs (50%)
unhatched_lavaspinner_eggs (50%)

delvea3410181, range=67 (-1565,-1526,-101)

delvea_monocle_2_9, range=32 (-1564,-1490,-102)

a_treasure_minder (50%)
a_treasure_minder (50%)

delvea_monocle_2_10, range=60 (-1527,-1412,-99)

a_treasure_fireguard (50%)
a_treasure_fireguard (50%)

delvea_monocle_2_11, range=41 (-1529,-1441,-101)

a_treasure_overseer (50%)
a_treasure_overseer (50%)

delvea_monocle_2_15, range=12 (-1565,-1446,-101)

#a_gold_chest (50%)
#a_gold_chest (50%)

delvea_monocle_3_1, range=0 (-1567,-1458,-103)

a_preying_lavaspinner (50%)

delvea_monocle_3_2, range=93 (-1474,-1453,-104)

a_preying_lavaspinner (50%)

delvea_monocle_3_46, range=55 (-1512,-1468,-104)

an_elder_lavaspinner (50%)

delvea_monocle_7_2, range=93 (-1474,-1453,-104)

a_preying_lavaspinner (50%)

delvea_monocle_7_46, range=55 (-1512,-1468,-104)

a_reclusive_lavaspinner (50%)

delvea_monocle_7_65, range=42 (-1529,-1477,-103)

#Hulking_Lavaspinner (50%)

delvea_monocle_8_28, range=55 (-1512,-1468,-104)

an_elder_lavaspinner (50%)