NPCs composing that spawngroup :

a_phase_spider (100%)

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

necropolis_28, range=167 (147,-2753,3)

necropolis_73, range=70 (-76,-2689,-37)

a_lava_keeper (100%)

necropolis_134, range=134 (67,-2833,15)

a_Chetari_darkling (50%)
a_Chetari_Warrior (50%)

necropolis_139, range=117 (-93,-2821,16)

a_Chelaki (50%)
a_Chetari_hunter (50%)

necropolis_140, range=17 (-2,-2727,14)

a_Chetari_Deathbinder (50%)
a_Chetari_worker (50%)

necropolis_141, range=107 (-88,-2648,14)

a_Chetari_Dustshaper (50%)
a_Chetari_worker (50%)

necropolis_142, range=158 (-177,-2729,14)

a_Chetari_hunter (50%)
a_Chetari_servant (50%)

necropolis_143, range=80 (52,-2692,14)

a_Chelaki (50%)
a_Chetari_guard (50%)

necropolis_144, range=113 (39,-2827,15)

a_Chetari_Dominator (50%)
a_Chetari_Dustshaper (50%)

an_empty_nest_190161, range=64 (-83,-2728,-26)

an_empty_nest (100%)