NPCs composing that spawngroup :

an_empty_nest (25%)

a_nest (75%)

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

necropolis_8, range=179 (775,-456,7)

a_phase_spider (50%)
a_phase_spider (50%)

necropolis_13, range=161 (957,-168,-255)

a_Chetari_Seeker (70%)
Seeker_Bulava (30%)

necropolis_17, range=146 (1003,-389,7)

necropolis_52, range=87 (828,-239,-255)

a_Chetari_Dustshaper (100%)

necropolis_53, range=52 (898,-261,-256)

a_Chetari_worker (100%)

necropolis_122, range=142 (913,-171,-256)

a_Chetari_neophyte (50%)
a_Chetari_seeker (50%)

necropolis_123, range=22 (874,-332,-255)

a_Chetari_Dominator (50%)
a_Chetari_Dustshaper (50%)

necropolis_124, range=147 (970,-193,-246)

a_Chetari_master (50%)
a_Chetari_seeker (50%)

Whelp_Kidnapper, range=166 (904,-145,-253)

Whelp_Kidnapper (100%)
Whelp_Kidnapper (100%)