NPCs composing that spawngroup :

an_ice_goblin (50%)

a_goblin_evoker (50%)

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

permafrost_10, range=75 (125,-318,3)

permafrost_11, range=86 (135,-329,3)

permafrost_16, range=75 (121,-341,3)

permafrost_20, range=75 (77,-385,3)

a_goblin_evoker (50%)
a_goblin_priest (50%)

permafrost_21, range=89 (91,-395,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_22, range=90 (106,-386,3)

an_ice_goblin (50%)
a_goblin_evoker (50%)

permafrost_23, range=30 (48,-345,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_25, range=18 (47,-333,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_29, range=27 (49,-288,3)

an_ice_goblin (50%)
a_goblin_prelate (50%)

permafrost_30, range=59 (48,-256,3)

an_ice_goblin (50%)
a_goblin_diviner (50%)

permafrost_31, range=45 (45,-270,3)

permafrost_81, range=84 (133,-330,3)

a_goblin_evoker (50%)
a_goblin_priest (50%)

permafrost_103, range=70 (120,-315,3)

an_ice_goblin (50%)
a_goblin_priest (50%)

permafrost_124, range=79 (124,-345,3)

an_ice_goblin (50%)
an_ice_goblin (50%)