NPCs composing that spawngroup :

a_goblin_back_biter (100%)

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

nurga_38, range=72 (-1943,-1256,-173)

a_goblin_life_drinker (50%)
a_goblin_miner (50%)

nurga_39, range=76 (-1933,-1295,-173)

nurga_40, range=59 (-1926,-1274,-173)

a_goblin_back_biter (50%)
a_goblin_blood_caster (50%)

nurga_41, range=66 (-1862,-1317,-173)

a_goblin_flame_douser (100%)

nurga_86, range=92 (-1780,-1234,-173)

nurga_87, range=92 (-1785,-1216,-173)

nurga_88, range=80 (-1791,-1250,-173)

a_goblin_life_drinker (50%)
a_goblin_miner (50%)

nurga_90, range=38 (-1867,-1213,-173)

a_goblin_blood_caster (50%)
a_goblin_blood_caster (50%)

nurga_200, range=68 (-1805,-1232,-173)

a_mine_rat (100%)

a_goblin_warder_189530, range=69 (-1935,-1277,-171)

a_goblin_warder (100%)

va_nurga_508003, range=96 (-1781,-1216,-172)

va_nurga_508013, range=80 (-1791,-1253,-172)

va_nurga_508030, range=69 (-1935,-1277,-172)