The character shield-bashes a target, gaining +10 attack, dealing normal damage as well as knocking the target off its feet for 3 seconds unless it passes a physical resistance check vs the attacker's strength attribute.
Shield Mastery adds the strength bonus a second time in the damage calculation. The bonus is not increased if the hit is critical.
Conjuration time: 1s.
20 additional Threat is supposed to be drawn from the target. As of Patch 1.02, only damage-based Threat is drawn.
Shield Bash can also free a party member from immobilizing effects such as Grab & Roots