NPCs composing that spawngroup :

a_treasure_overseer (50%)

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

delvea3410090, range=30 (-1146,-1685,-42)

delvea3410091, range=40 (-1210,-1661,-38)

an_elder_lavaspinner (50%)
a_reclusive_lavaspinner (50%)

delvea3410092, range=48 (-1196,-1728,-37)

an_elder_lavaspinner (50%)
an_elder_lavaspinner (50%)

delvea3410180, range=19 (-1186,-1700,-39)

unhatched_lavaspinner_eggs (50%)

delvea_monocle_2_3, range=30 (-1181,-1713,-37)

a_treasure_fireguard (50%)

delvea_monocle_2_4, range=24 (-1193,-1666,-38)

a_treasure_sneak (50%)

delvea_monocle_2_13, range=26 (-1156,-1666,-38)

#a_gilded_chest (50%)

delvea_monocle_2_36, range=47 (-1195,-1727,-38)

a_reclusive_lavaspinner (50%)

delvea_monocle_2_37, range=40 (-1209,-1660,-38)

an_elder_lavaspinner (50%)

delvea_monocle_3_39, range=31 (-1145,-1684,-42)

an_elder_lavaspinner (50%)

delvea_monocle_3_40, range=47 (-1195,-1727,-38)

an_elder_lavaspinner (50%)

delvea_monocle_3_41, range=40 (-1209,-1660,-38)

an_elder_lavaspinner (50%)

delvea_monocle_4_25, range=47 (-1195,-1727,-38)

an_elder_lavaspinner (50%)

delvea_monocle_4_33, range=40 (-1209,-1660,-38)

a_reclusive_lavaspinner (50%)

delvea_monocle_4_38, range=31 (-1145,-1684,-42)

an_elder_lavaspinner (50%)

delvea_monocle_7_39, range=31 (-1145,-1684,-42)

an_elder_lavaspinner (50%)

delvea_monocle_7_40, range=47 (-1195,-1727,-38)

a_reclusive_lavaspinner (50%)

delvea_monocle_7_41, range=40 (-1209,-1660,-38)

an_elder_lavaspinner (50%)

delvea_monocle_7_67, range=17 (-1192,-1690,-39)

Lavaspinner_Protector (50%)

delvea_monocle_8_21, range=31 (-1145,-1684,-42)

an_elder_lavaspinner (50%)

delvea_monocle_8_22, range=47 (-1195,-1727,-38)

an_elder_lavaspinner (50%)

delvea_monocle_8_23, range=40 (-1209,-1660,-38)

a_reclusive_lavaspinner (50%)