NPCs composing that spawngroup :

a_goblin_frost_caller (50%)

a_goblin_spirit_terror (50%)

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

nurga_74, range=96 (-2360,-838,-221)

a_goblin_slave_keeper (100%)

nurga_75, range=89 (-2257,-969,-221)

a_diseased_mine_rat (50%)
a_goblin_spirit_terror (50%)

nurga_76, range=22 (-2361,-935,-221)

a_goblin_slave_keeper (50%)
a_goblin_soul_stealer (50%)

nurga_78, range=56 (-2292,-963,-221)

a_goblin_spirit_terror (50%)
a_goblin_spirit_terror (50%)

va_nurga_508013, range=69 (-2271,-947,-220)

va_nurga_508030, range=84 (-2273,-984,-220)