Sentinel replaces Guardian. The warrior leaps up to two tiles in order to intercept foes who pass nearby, performing a reaction strike and stopping their movement.
Using Sentinel ends a heroes turn. If an enemy then enters a two tile radius, the hero pins them by jumping in front of them and then attacking them.
Sentinel can be used to block pathways and/or jump to an ally to help them. The leap is useful for ignoring enemies and difficult terrain.