Quote Originally Posted by Eboric View Post
You also get another shield bash that stops the mob from using weapon skills for a few secs at 30. You can use it any time you block an attack.
That's Shield Swipe - it's essentially the same as Phalanx from 1.23 but with an enemy weapon skill binding debuff added. It's gained as the reward for completing the final GLA class quest at level 30.