NPCs composing that spawngroup :

a_voracious_hatchling (25%)

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

necropolis_33, range=153 (86,-1231,-149)

necropolis_34, range=123 (-15,-1225,-114)

necropolis_35, range=39 (-7,-1387,-38)

a_wave_of_cold_190141, range=46 (17,-1384,-26)

an_empty_nest_190162, range=84 (-21,-1264,-95)

an_empty_nest_190163, range=106 (-18,-1242,-100)