On parry of any attack, with the exception of projectiles, generates a force field that lasts for 2 seconds and makes the player invincible for that duration.
Because Rampart's force field blocks attacks for several seconds, it is very useful against enemies with melee combo hits such as the Slasher and the Rampager.
Coincidently, both shields have the ability to generate force fields.
After the original version of the Front Line Shield was removed from the game, Rampart now has the highest block damage reduction out of all shields at 85%, only 5% lower than the old Front Line Shield.