Defensive Adaptability

As a Warforged, you are able to learn fast and adapt in combat. You gain the following benefits:

• After being hit by a creature you can make a DC 10 intelligence investigation check. On a success you can increase your AC equal to half your CON modifier (minimum 1). This additional AC is only applied for that creature.
• If you get hit again and succeed on a DC 15 intelligence investigation check, the creature has disadvantage on attack rolls when the attack targets you.