NPCs composing that spawngroup :

an_earth_elemental (33%)

an_earth_elemental (33%)

an_earth_elemental (34%)

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

najena_84, range=35 (8,413,3)

najena_83, range=55 (-27,357,4)

najena_76, range=95 (60,469,4)

a_large_skeleton (50%)
a_large_skeleton (50%)

najena_52, range=50 (72,369,3)

najena_50, range=61 (65,426,3)

najena_1, range=64 (59,327,2)