NPCs composing that spawngroup :

a_goblin_flame_chanter (50%)

a_goblin_spirit_chanter (50%)

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

nurga_92, range=55 (-1165,628,-189)

nurga_96, range=38 (-1205,617,-189)

nurga_100, range=74 (-1130,619,-189)

a_goblin_death_caster (50%)
a_goblin_spirit_chanter (50%)

nurga_102, range=70 (-1170,513,-189)

a_goblin_overseer (50%)
a_goblin_overseer (50%)

nurga_182, range=75 (-1190,655,-189)

a_goblin_death_caster (50%)
a_goblin_death_knight (50%)

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

va_nurga_508013, range=71 (-1171,512,-188)

va_nurga_508077, range=78 (-1188,658,-188)