NPCs composing that spawngroup :

a_goblin_evoker (50%)

a_goblin_prelate (50%)

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

permafrost_1, range=75 (240,-316,3)

permafrost_14, range=65 (300,-310,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_18, range=23 (311,-370,4)

permafrost_19, range=61 (348,-361,3)

permafrost_69, range=83 (269,-455,3)

a_goblin_evoker (100%)