NPCs composing that spawngroup :

a_drolvarg_sentry (60%)

sentry_of_Sathir (10%)

skeletal_guardian (30%)

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

karnor_a_drolvarg_sentry6, range=37 (-19,-351,31)

a_drolvarg_sentry (50%)
a_drolvarg_sentry (50%)

karnor_skeletal_guardian14, range=60 (-18,-254,3)

skeletal_guardian (50%)
skeletal_guardian (50%)

karnor_223365, range=29 (-11,-342,31)

karnor_223379, range=95 (75,-304,3)

karnor skeletal warlord, range=83 (12,-237,3)