Regenerative Cells

Your body has gained the ability to manipulate the rate at which it duplicates its own cells. Whether by magical or natural means, your adaptability has increased to a new extreme.

Upon selecting this feat, you gain a passive regeneration equal to your constitution modifier, you regain this Hp at the start of each of your turns but gain nothing if you are at or above maximum Hp. In addition to this regenerative quality, you may regenerate minor limbs and heal any non-major injuries to your body much faster than the average person. Upon losing a limb or suffering an injury, roll a d4, the result dictates how many days it takes you to fully regenerate the damaged tissue. If your head is destroyed or severely damaged, or if you are dying or unconscious, this ability ceases to function immediately as it requires mental focus and control of your body.

In addition, while outside of combat, you no longer need to be resting to use your Hit Dice (Note: You do not regenerate Hp passively while outside of combat).

Starting at level 4 when you are at or below 10 Hp, your regeneration doubles. This effect ends when you are restored to maximum Hp.

Finally, at level 7, You can also use a bonus action to instantly regrow a limb or damaged part of your body. You regain the use of this bonus action after a short rest and 10 minutes after using it, you suffer from level 1 of exhaustion or increase your exhaustion by 1 level.