NPCs composing that spawngroup :

an_empty_nest (25%)

a_nest (75%)

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

necropolis_42, range=24 (1338,927,-100)

an_amorphous_mass (50%)
an_amorphous_mass (50%)

necropolis_43, range=34 (1330,919,-99)

an_amorphous_mass (100%)

necropolis_44, range=137 (1430,1052,-122)

an_amorphous_mass (50%)
an_amorphous_mass (50%)

necropolis_46, range=194 (1556,914,-150)

an_amorphous_mass (50%)
an_amorphous_mass (50%)

necropolis_47, range=187 (1548,906,-151)

an_amorphous_mass (50%)
an_amorphous_mass (50%)

necropolis_48, range=140 (1502,935,-146)

an_amorphous_mass (50%)
an_amorphous_mass (50%)

necropolis_49, range=132 (1494,927,-148)

an_amorphous_mass (50%)
an_amorphous_mass (50%)

necropolis_50, range=90 (1384,844,-90)

an_amorphous_mass (50%)
an_amorphous_mass (50%)

an_inactive_trap_190119, range=163 (1366,769,-82)

an_inactive_trap_190120, range=94 (1371,1026,-106)