NPCs composing that spawngroup :

a_grimling_manacrafter (34%)

a_grimling_mystic (33%)

a_grimling_overseer (33%)

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

Dreadmaw_Wolfkin_1433300, range=69 (3533,1997,155)

#Gniktar_Grinwit (25%)
a_grimling_mystic (75%)

HollowshGremlinan__denmaste, range=169 (3439,1948,149)

#Wiknak_Grimglom (20%)
a_grimling_manacrafter (80%)

HollowshGremlinan__spurclaw, range=169 (3639,1827,158)

a_grimling_spiritist (100%)

HollowshOwls2428048, range=0 (3603,1993,164)

#Skrietat_Chu (35%)
an_owlbear_fleshrender (65%)

HollowshDreadmaw_Wolfkin_24333, range=69 (3533,1997,155)

an_owlbear_bonegrinder (100%)

HollowshOwls_an_denmast, range=169 (3439,1948,149)

HollowshOwls_an_spurcla, range=169 (3639,1827,158)

an_owlbear_spurclaw (100%)

HollowshWolves1328048, range=0 (3603,1993,164)

a_sonic_devourer (100%)

Hollowsh_WolvesDreadmaw_Wolfki, range=69 (3533,1997,155)

#Dreadmaw_Wolfkin (25%)
a_sonic_guardian (75%)

HollowshWolvesan__denmast, range=169 (3439,1948,149)

#Warpaw_Dankpelt (20%)
a_sonic_warwolf (80%)

HollowshWolvesan__spurcla, range=169 (3639,1827,158)