Defense
From Fallen Sword Wiki
Defense is one of five stats that helps determine the outcomes of a battle.
The other stats are Attack, Armor, Damage, and HP.
Defense increases your ability to sustain from being attacked. A player with high defense will need more Attack to get through.
A player's Defense can be raised by the Skill Buff Constitution, as well as raising the base Defense with Evade, Rock Skin, and Aura of Protection.