NPCs composing that spawngroup :

Venril_Sathirs_remains (100%)

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

karnor_decayed_prisoner58, range=86 (-41,-638,-23)

decayed_prisoner (50%)
decayed_prisoner (50%)

karnor_223364, range=62 (-79,-621,-23)

karnor_223366, range=70 (-15,-525,-35)

karnor_223370, range=72 (-25,-508,-33)

a_drolvarg_sentry (65%)
spectral_curate (35%)

karnor_223376, range=79 (0,-540,19)

karnor skeletal berserker, range=72 (-21,-513,3)