NPCs composing that spawngroup :

a_Scion_crypt_creeper (50%)

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

mmcf2580001, range=77 (-517,612,40)

mmcf2580007, range=90 (-545,448,38)

mmcf2580019, range=42 (-537,580,37)

mmcf2580034, range=87 (-548,625,38)

mmcf2580035, range=95 (-498,624,37)

mmcf2580036, range=42 (-517,574,36)

mmcf2580038, range=42 (-517,502,36)

mmcf2580039, range=65 (-542,473,37)