NPCs composing that spawngroup :

a_grimling_herbalist (33%)

a_grimling_priest (33%)

a_war_painted_skullcracker (34%)

NPCs spawning around that spawngroup :
(Max range : 100)

acrylia_a_grimling_fire_eater319, range=97 (-260,-496,-6)

a_grimling_fire_eater (50%)
a_grimling_manacrafter (50%)

acrylia_224797, range=52 (-248,-434,3)

acrylia_224798, range=28 (-173,-437,1)

a_grimling_priest (100%)

acrylia_224800, range=61 (-253,-447,2)

a_possessed_corpse (50%)
a_possessed_corpse (50%)

acrylia_224813, range=93 (-142,-345,-20)

acrylia_224817, range=94 (-159,-507,-6)

a_grimling_deathbringer (50%)
a_grimling_priest (50%)

acrylia_224821, range=87 (-179,-335,-21)

acrylia_224826, range=31 (-208,-451,1)

a_grimling_cadaverist (75%)
Corpseraiser_Gilgaplank (25%)