NPCs composing that spawngroup :

#Overseer_Dlubish (72%)

a_goblin_backbiter (62%)

a_goblin_blightcaller (64%)

a_goblin_boneseer (64%)

a_goblin_dirttracer (58%)

a_goblin_flashdrowser (64%)

a_goblin_slavedriver (65%)

a_goblin_stalagknight (58%)

a_goblin_stonechanter (64%)

a_goblin_warder (72%)

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

nurga_172, range=3 (-1446,713,-237)

nurga_174, range=48 (-1413,751,-237)

a_goblin_flame_chanter (60%)
a_goblin_spirit_chanter (60%)

nurga_175, range=44 (-1453,756,-237)

a_goblin_death_knight (60%)
a_goblin_overseer (60%)

nurga_a_goblin_backbiter5_takp_import_v0, range=47 (-1453,759,-236)

nurga_a_goblin_dirttracer6_takp_import_v0, range=50 (-1414,754,-236)