NPCs composing that spawngroup :

a_goblin_blight_caster (50%)

a_goblin_spirit_mystic (50%)

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

nurga_191, range=45 (-1432,-1275,-173)

a_goblin_arcane_master (50%)
a_vicious_mine_rat (50%)

nurga_192, range=99 (-1421,-1187,-173)

a_goblin_arcane_master (50%)
a_goblin_spirit_mystic (50%)

nurga_193, range=77 (-1349,-1214,-173)

a_goblin_life_stealer (50%)
a_goblin_slave_driver (50%)

nurga_194, range=55 (-1343,-1247,-173)

a_goblin_blight_caster (50%)
a_goblin_spirit_mystic (50%)

va_nurga_508003, range=59 (-1341,-1244,-172)

va_nurga_508009, range=2 (-1387,-1283,-172)

va_nurga_508030, range=98 (-1417,-1187,-172)