NPCs composing that spawngroup :

an_elder_lavaspinner (50%)

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

delvea3410074, range=73 (-839,-1599,19)

delvea3410075, range=77 (-845,-1548,24)

delvea3410076, range=0 (-771,-1570,23)

delvea_monocle_2_6, range=23 (-793,-1573,22)

a_treasure_minder (50%)
a_treasure_minder (50%)

delvea_monocle_2_7, range=73 (-841,-1553,24)

a_treasure_keeper (50%)
a_treasure_keeper (50%)

delvea_monocle_2_8, range=48 (-818,-1569,23)

a_treasure_overseer (50%)
a_treasure_overseer (50%)

delvea_monocle_2_14, range=80 (-850,-1581,22)

#a_cracked_chest (50%)
#a_cracked_chest (50%)

delvea_monocle_2_30, range=0 (-770,-1570,24)

an_elder_lavaspinner (50%)
an_elder_lavaspinner (50%)

delvea_monocle_3_31, range=77 (-844,-1547,24)

an_elder_lavaspinner (50%)

delvea_monocle_3_32, range=73 (-838,-1598,19)

a_reclusive_lavaspinner (50%)

delvea_monocle_3_33, range=0 (-770,-1570,24)

an_elder_lavaspinner (50%)

delvea_monocle_4_75, range=73 (-838,-1598,19)

a_reclusive_lavaspinner (50%)

delvea_monocle_4_84, range=77 (-844,-1547,24)

a_reclusive_lavaspinner (50%)

delvea_monocle_7_31, range=77 (-844,-1547,24)

a_reclusive_lavaspinner (50%)

delvea_monocle_7_32, range=73 (-838,-1598,19)

a_reclusive_lavaspinner (50%)

delvea_monocle_7_33, range=0 (-770,-1570,24)

a_reclusive_lavaspinner (50%)

delvea_monocle_7_66, range=52 (-820,-1585,21)

Lavaspinner_Protector (50%)

delvea_monocle_8_13, range=77 (-844,-1547,24)

an_elder_lavaspinner (50%)

delvea_monocle_8_14, range=73 (-838,-1598,19)

an_elder_lavaspinner (50%)

delvea_monocle_8_15, range=0 (-770,-1570,24)

an_elder_lavaspinner (50%)