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

Improved Shield Bash

Gives your Shield Bash ability a 50/100% chance to Silence the target for 3 sec.

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

Compared with Classic

Classic tooltip

Gives your Shield Bash ability a 50% chance to silence the target for 3 sec.

Data	Classic	Forever
effect 1 value	0	100

What Blizzard said about Improved Shield Bash, each line checked against the files.

Matches the files
Improved Shield Bash moved to Row 4 (Was Row 5).
The files The Oct 2 server hotfix (read from the 70245 client cache) moved Improved Shield Bash's node (105963) from row 5 to row 4 (PosY 4530 to 3930).
Improved Shield Bash Development Notes, October 1
Matches the files
Improved Shield Bash moved to Row 4 (Was Row 5).
The files Row 5 to row 4 in the 70245 hotfix (PosY 4530 to 3930), spell 12311.
Improved Shield Bash Warrior updates, October 2

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