NPCs composing that spawngroup :

a_goblin_death_knight (33%)

a_goblin_overseer (33%)

a_goblin_warder (34%)

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

nurga_99, range=36 (-1637,630,-221)

a_goblin_flame_chanter (50%)
a_goblin_spirit_chanter (50%)

nurga_129, range=51 (-1669,643,-221)

a_goblin_blackguard (50%)
a_goblin_death_knight (50%)

nurga_178, range=41 (-1689,605,-221)

a_goblin_blackguard (50%)
a_goblin_flame_chanter (50%)

va_nurga_508003, range=39 (-1687,608,-220)

va_nurga_508009, range=3 (-1646,595,-220)