Warriors are the only class that can break down weak walls, signified by a cracked shield icon. This often opens up areas that would otherwise be inaccessible. They can also break red lyrium deposits in one hit using this ability, whereas other classes need two or more strikes to do so, see the companion side-quest Seeing Red for details.
Warriors are also the only class that generates Guard through class abilities, see that page for details.
Battle-hardened and masters of close combat, warriors are pivotal to any group entering battle. As front-line fighters, they absorb the brunt of opponent attacks, steal enemy focus, and create an opening for deadly ranged assaults from other classes. While some warriors prefer visceral, sweeping damage, many are silverite-clad bulwarks, weathering any blows they don’t deflect with their shields.
Champions are defenders and protectors, and when a warrior trains in the champion’s tradition, he or she becomes unstoppable. Champions use their armor, weapon and awareness to shrug off incoming attacks while holding critical positions on the battlefield and protecting allies in the process.