NPCs composing that spawngroup :

an_alarm (8%)

an_immobilizer (8%)

an_inactive_trap (8%)

a_blast_of_heat (8%)

a_formless_terror (8%)

a_magi_construct (8%)

a_null_field (8%)

a_singularity (8%)

a_spike_trap (12%)

a_wardstone (8%)

a_wave_of_cold (8%)

a_wizard_construct (8%)

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

necropolis_64, range=135 (74,-2096,-255)

a_carrion_bat (100%)

necropolis_70, range=182 (303,-2217,-255)

a_Chelaki (50%)
a_Chetari_adolescent (50%)

necropolis_98, range=42 (227,-2027,-255)

necropolis_146, range=102 (177,-1964,-257)

a_Chetari_hunter (50%)
a_Chetari_Scavenger (50%)

necropolis_147, range=105 (211,-2168,-255)

necropolis_151, range=183 (363,-1969,-256)

an_inactive_trap_190089, range=152 (64,-2120,-248)

an_idle_trigger_190147, range=106 (207,-1957,-256)

an_idle_trigger (100%)