In Battle for Azeroth Season 4, the maximum stats on rewards from Mythic Keystone dungeons will be increasing, with item level continuing to improve up through Mythic 15. Completing a Mythic 15 dungeon in Season 4 will award item level 475 gear in the weekly chest (this is equal to Mythic raid quality), and the maximum end-of-run reward will be iLvl 465.