NPCs composing that spawngroup :

a_goblin_blackguard (33%)

a_goblin_flame_chanter (33%)

a_goblin_warder (34%)

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

nurga_102, range=40 (-1475,1539,-300)

a_goblin_overseer (50%)
a_goblin_overseer (50%)

nurga_126, range=49 (-1477,1549,-300)

a_goblin_spirit_chanter (100%)

nurga_163, range=97 (-1528,1566,-300)

a_goblin_blackguard (50%)
a_goblin_overseer (50%)

nurga_164, range=93 (-1496,1589,-300)

nurga_165, range=83 (-1458,1590,-300)

a_goblin_death_caster (50%)
a_goblin_spirit_chanter (50%)

nurga_167, range=39 (-1430,1540,-300)