Reduce incoming damage from a single attack by your Defense. Some damage may not be avoidable (e.g., psychic damage, or some areas of effect).
Split Defense
SSanityWithInWhen you defend you can choose to defend with full or with half armor value. If you choose the latter you can defend a second time this round for free (for the other half of the armor value).
Why use this? This variant rule is an option to allow high armor characters a bit more value against multiple smaller attacks, without adding too much crunch or impact encounter math.
Augments
Heroic Reactions
Reactions cost 1 action and are generally performed when it is not your turn. A hero can perform each reaction no more than 1/round, and they will start their turn with fewer actions. The reactions are: