NPCs composing that spawngroup :

a_blizzard_hunter (20%)

a_blizzard_spider (20%)

a_crystalline_watcher (20%)

a_Frenzied_Velium_Stalker (20%)

a_shard_spider (20%)

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

velketor_1, range=45 (448,102,-186)

velketor_6, range=88 (427,8,-45)

a_crystal_statue (100%)

velketor_99115, range=75 (410,70,35)

velketor_99118, range=73 (479,2,87)

velketor_99119, range=90 (440,154,87)

velketor_276635, range=79 (476,-4,6)

a_crystalline_watcher (80%)
Crystal_Eyes (20%)