Priest talent · row 6 of Discipline, from level 35 (30 with Talented 5/5) · Physical

Divine Aegis

Your critical heals create a protective shield on the target, absorbing 5/10/15% of the amount healed. Lasts 12 sec.

Game files · build 1.60.1.70291New in ForeverRead straight from the WoW Forever beta client.

Compared with Classic

Classic tooltip

Critical heals create a protective shield on the target, absorbing 30% of the amount healed. Lasts 12 sec.

What Blizzard said about Divine Aegis, each line checked against the files.

Partly
Divine Aegis: Critical heals create an absorb shield for 12 seconds on your target based on a percentage of the amount healed. This effect does not stack.
The files The tooltip has critical heals shield the target for 5/10/15% of the heal for 12 sec (Discipline row 6). The no-stacking rule isn't in any field we can read.
Divine Aegis Divine Aegis Class deep dives: Priest and Warrior

69876 Sep 16First beta build we archived. No changes in the client files since.