as a monk you have learned of a way to extract ki from your own blood using a frowned upon technique. This will grant many blood related abilities that will become clear in time.

Ki extraction

starting at third level, you have learned how to extract the ki from your own blood. When ever you have run out of ki points, you can extract the ki from your blood and do ki techniques anyway, however you take damage equal to the ki point required to use the technique.

hour of blood

starting at 6th level, when you attack with an unarmed strike or flurry of blows, you can spend two ki points, and roll your monk die again, add the number rolled to the damage.

mastery of blood

starting at 11th level, when you slay an enemy, you regain hit points equal to your monk level, plus your dexterity modifier.

touch of the crimson veins

starting at level 17, you have learned to overload a target's bloodstream with so much ki that they expload.
-after using a flurry of blows you can spend 1-10 ki points, deal 2d10 force damage for each point spent