NPCs composing that spawngroup :

a_goblin_blackguard (33%)

a_goblin_warder (34%)

a_menacing_mine_rat (33%)

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

nurga_92, range=41 (-1165,628,-189)

nurga_99, range=38 (-1193,580,-189)

a_goblin_flame_chanter (50%)
a_goblin_spirit_chanter (50%)

nurga_100, range=75 (-1130,619,-189)

a_goblin_death_caster (50%)
a_goblin_spirit_chanter (50%)

nurga_182, range=40 (-1190,655,-189)

a_goblin_death_caster (50%)
a_goblin_death_knight (50%)

va_nurga_508003, range=72 (-1133,620,-188)

va_nurga_508077, range=44 (-1188,658,-188)