NPCs composing that spawngroup :

a_goblin_blood_knight (100%)

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

nurga_135, range=53 (-1158,-534,-173)

nurga_150, range=61 (-1114,-545,-173)

a_goblin_flame_dancer (50%)
a_goblin_spirit_lord (50%)

nurga_152, range=22 (-1144,-507,-173)

a_goblin_death_caller (50%)
a_goblin_flame_dancer (50%)

nurga_153, range=33 (-1160,-506,-173)

a_goblin_sneak (50%)
a_goblin_taskmaster (50%)

va_nurga_508003, range=3 (-1134,-484,-172)

va_nurga_508009, range=31 (-1162,-499,-172)

va_nurga_508077, range=22 (-1141,-508,-172)