Cursed Technique Hot Streak

Your cursed energy manifests itself around yourself when you show immense acts of luck, whenever you roll a nat 20 you gain 1 luck point to a max of 3, whenever you roll a nat 1 you lose all luck points, you can expend a luck point as a reaction when taking damage to half the damage, if you are reduced to 0 hit points while having 3 luck points you regain hit points equal to twice your level, you can also expend curse energy to bend luck to your favor, as a free action you may expand a cursed energy upon rolling a d20 and gain advantage on the roll