NPCs composing that spawngroup :

a_blizzard_spider (25%)

a_crystalline_watcher (25%)

a_fierce_blizzard_hunter (25%)

a_shard_spider (25%)

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

velketor_1, range=78 (303,60,35)

velketor_55, range=89 (178,135,-54)

Velketor_the_Sorcerer (100%)

velketor_59, range=73 (152,47,7)

a_crystalline_gargoyle (50%)
a_crystal_gargoyle (50%)

velketor_61, range=28 (197,66,-112)

a_velium_stalker (50%)
The_Brood_Master (50%)

velketor_62, range=54 (184,23,-111)

velketor_63, range=44 (183,74,-112)

velketor_65, range=32 (197,76,-112)

velketor_92, range=74 (172,112,6)

velketor_94, range=64 (172,96,-58)

Crystal_Guardian (100%)

six_189764, range=64 (179,14,-109)

A_chill (50%)
six (50%)