Priest talent · row 1 of Discipline, from level 10 (5 with Talented 5/5) · Physical

Twin Disciplines

Increases the damage and healing of your instant cast spells by 1/2/3/4/5%.

Game files · build 1.60.1.70245New in ForeverRead from the WoW Forever beta client, build 1.60.1.70245.

In Blizzard's notes

What Blizzard said about Twin Disciplines, each line checked against the files.

Matches the files
Twin Disciplines: (New row 1 talent.) Increases damage and healing done by instant cast spells.
The files New Discipline row 1 talent (talent position) that adds 1-5% damage and healing to instant spells (tooltip).
Twin Disciplines Class deep dives: Priest and Warrior

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