For the achievement, see First Blood.
First Blood is a passive feature that causes targets to bleed.
Description
On a hit, inflict 
upon targets that have maximum Hit Points.
Condition: Bleeding
Duration: 2 turns
- Creature takes 2
Slashing damage at the start of each turn and has 
Disadvantage on Constitution 
Saving throws. - Removed by healing.
How to learn
Bugs
Does not work on honor mode