NPCs composing that spawngroup :

a_goblin_blood_caster (100%)

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

nurga_43, range=85 (-2062,-1522,-173)

nurga_44, range=96 (-2110,-1502,-173)

a_goblin_blood_caster (50%)
a_goblin_spirit_weaver (50%)

nurga_45, range=27 (-2129,-1598,-191)

a_goblin_back_biter (50%)
a_goblin_life_drinker (50%)

va_nurga_508003, range=83 (-2065,-1523,-172)

va_nurga_508009, range=72 (-2117,-1527,-172)