Wll, technically no matter the spec its a mitigation spec, but the way it mitigates can be done differently.

RIFT: Every time the rogue teleports, a shield is created that absorbs 10% of incoming damage on up to X amount of damage taken.

Warrior: Void knight takes 10% less damage.

Dark knight: While the DK is under this effect, 10% of all damage taken is absorbed as health.

Same mitigation, just done differently.