NPCs composing that spawngroup :

a_calcified_skeleton (50%)

a_skeleton (50%)

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

Nek1_RegGreaterSkeleton, range=33 (528,-753,-5)

a_greater_skeleton (50%)
a_skeleton (50%)

Nek1_Calc/HalfSkeleton, range=33 (531,-718,-7)

a_calcified_skeleton (50%)
a_halfling_skeleton (50%)

Nek3_newbie_fields_low, range=97 (499,-831,30)