Druid talent · row 4 of Balance, from level 25 (20 with Talented 5/5) · Physical

Vengeance

Increases the critical strike damage bonus of your Arcane and Nature spells by 20/40/60/80/100%.

Game files · build 1.60.1.70245Read from the WoW Forever beta client, build 1.60.1.70245.

Compared with Classic

Classic tooltip

Increases the critical strike damage bonus of your Starfire, Moonfire, and Wrath spells by 20%.

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

Matches the files
Vengeance: Now applies to all damaging spells.
The files Druid Vengeance (16909) covers Wrath, Moonfire, Starfire, Entangling Roots, Insect Swarm and Hurricane (class mask), every Druid damage spell but Thorns. Classic covered Starfire, Moonfire and Wrath.
Vengeance Class deep dives: Hunter and Druid

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