NPCs composing that spawngroup :

#The_Fabled_Skeletal_Captain (5%)

skeletal_captain (25%)

skeletal_lookout (20%)

skeletal_lookout (25%)

skeletal_watcher (25%)

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

karnor_15, range=65 (133,-247,45)

skeletal_guardian (75%)
skeletal_warlord (25%)

karnor_49, range=69 (175,-148,-12)

a_drolvarg_sentry (50%)
spectral_caller (50%)

karnor_66, range=26 (179,-191,-12)

spectral_caller (100%)

karnor_287966, range=0 (191,-215,45)

karnor_287999, range=69 (175,-148,-12)

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

karnor_288006, range=65 (133,-247,45)

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

karnor_288009, range=26 (179,-191,-12)

spectral_caller_# (100%)