NPCs composing that spawngroup :

a_Burynai_slave (100%)

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

nurga_32, range=25 (-1534,-901,-172)

a_goblin_blight_caster (50%)
a_goblin_spirit_mystic (50%)

nurga_46, range=86 (-1505,-983,-221)

a_goblin_gold_hoarder (100%)

nurga_47, range=69 (-1527,-964,-221)

a_goblin_blightcaller (50%)
a_goblin_frost_caller (50%)

nurga_49, range=10 (-1517,-903,-221)

#Frost_Caller_Ollikaz (20%)
a_goblin_frost_caller (80%)

nurga_50, range=41 (-1550,-898,-221)

nurga_51, range=82 (-1590,-914,-221)

a_goblin_slave_keeper (50%)
a_goblin_soul_stealer (50%)

nurga_52, range=51 (-1551,-927,-221)

a_goblin_blightcaller (50%)
a_goblin_frost_caller (50%)

va_nurga_508003, range=82 (-1504,-979,-220)

va_nurga_508057, range=41 (-1550,-900,-220)

va_nurga_508079, range=0 (-1509,-897,-221)