NPCs composing that spawngroup :

an_earth_elemental (33%)

a_mist_elemental (33%)

a_mist_elemental (34%)

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

najena_84, range=58 (8,413,3)

najena_77, range=69 (63,495,4)

a_large_skeleton (100%)

najena_76, range=43 (60,469,4)

a_large_skeleton (50%)
a_large_skeleton (50%)

najena_75, range=99 (-16,484,4)

a_large_skeleton (50%)
a_large_skeleton (50%)

najena_52, range=57 (72,369,3)

najena_51, range=61 (23,381,4)

najena_1, range=99 (59,327,2)