TLDR; 35 for doing the Empowered 7.2. questline, 36 for the first 7.2 trait, 41 for the second, 46 for the third, and 51 for the fourth.
As we transition from Patch 7.1.5 to Patch 7.2, you’ll get a lower-level Keystone with the reset this week than you may otherwise be expecting. This is due to the increase in difficulty of these dungeons in Patch 7.2. For example, if you completed a level 9 Keystone in patch 7.1.5 and then were given the usual level 6 Keystone next week, that’d actually be an increase in difficulty. To avoid this, we’re making these adjustments for this week only to reduce the level of Keystone you receive based on what you’ve completed this week: