NPCs composing that spawngroup :

a_crystal_crawler (50%)

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

crystal_20, range=32 (-334,173,-559)

crystal_25, range=67 (-321,206,-384)

crystal_37, range=88 (-322,229,-400)

crystal_41, range=96 (-261,193,-384)

crystal_46, range=85 (-261,165,-400)

crystal_71, range=36 (-380,145,-524)

crystal_73, range=76 (-362,69,-523)

crystal_81, range=39 (-362,106,-523)