https://bit.ly/3sg3V0b
简单说,下周保底要开15层KEY这周要限时18或者19以上烧掉
Hello Krystallíne!
When Season 3 begins next week, Mythic+ Keystones will be lowered by an
additional 3 levels to account for the overall increase in dungeon
difficulty. If you’d like to open your Great Vault next week and earn a +15
Keystone, you’ll need to time a +18 or complete a +19 untimed before next
weekly regional maintenance.
Hope this helps clear things up.