You protect yourself from harm, your shield an extension of your body.
Prerequisite: Tower Shield proficiency, Improved Shield Bash
Benefit: The penalties to attack rolls for using a tower shield are reduced by 1, and you receive a +4 bonus to your CMD against attempts to sunder or disarm your tower shield. In addition, you can use a tower shield to make a shield bash as if it were a heavy shield, though it deals 1d6 damage for a medium sized creature on a hit.
Normal: You can’t shield bash with a tower shield.
Path of Iron, © 2015, Ascension Games, LLC; Author Christopher Moore