NPCs composing that spawngroup :

a_grimling_lookout (50%)

a_grimling_overseer (50%)

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

HollowshGremlin1328063, range=53 (-1568,-1236,-106)

HollowshOwls2428063, range=53 (-1568,-1236,-106)

HollowshOwls2428105, range=0 (-1522,-1209,-100)

an_owlbear_fleshrender (50%)
an_owlbear_ravager (50%)

HollowshWolves1328063, range=53 (-1568,-1236,-106)

HollowshWolves1328105, range=0 (-1522,-1209,-100)

a_sonic_ravager (50%)
a_sonic_warwolf (50%)