NPCs composing that spawngroup :

spectral_caller_# (100%)

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

karnor_15, range=71 (133,-247,45)

skeletal_guardian (75%)
skeletal_warlord (25%)

karnor_49, range=43 (175,-148,-12)

a_drolvarg_sentry (50%)
spectral_caller (50%)

karnor_66, range=0 (179,-191,-12)

spectral_caller (100%)

karnor_72, range=87 (145,-110,34)

##_The_Ultrafabled_Drolvarg_Captain (5%)
#The_Fabled_Drolvarg_Captain (6%)
a_drolvarg_captain (42%)
a_drolvarg_sentry (25%)
a_drolvarg_sentry (23%)

karnor_121, range=26 (191,-215,45)

karnor_287966, range=26 (191,-215,45)

karnor_287999, range=43 (175,-148,-12)

a_drolvarg_sentry_# (50%)
spectral_caller_# (50%)

karnor_288006, range=71 (133,-247,45)

skeletal_guardian_## (50%)
skeletal_protector_# (50%)