NPCs composing that spawngroup :

an_owlbear_fleshrender (34%)

an_owlbear_grappler (33%)

an_owlbear_ravager (33%)

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

HollowshGremlin1328247, range=1 (648,-3016,71)

a_grimling_manacrafter (50%)
a_grimling_soldier (50%)

HollowshGremlina1627094, range=85 (563,-2999,54)

HollowshGremlina_patrolling_so, range=30 (627,-2994,59)

HollowshGremlin1319766, range=33 (667,-2990,63)

HollowshOwls231976, range=33 (667,-2990,63)

HollowshOwls262709, range=85 (563,-2999,54)

HollowshOwlsa_patrolling_soni, range=30 (627,-2994,59)

HollowshWolves1328247, range=1 (648,-3016,71)

a_sonic_wolf (100%)

HollowshWolvesa_sonic_wolf1319, range=33 (667,-2990,63)

a_sonic_stalker (50%)
a_sonic_wolf (50%)

HollowshWolvesa_sonic_wolf1627, range=85 (563,-2999,54)

a_sonic_wolf (100%)

HollowshWolvesa_patrolling_son, range=30 (627,-2994,59)

a_patrolling_sonic_wolf (100%)