Life Syphon

-Increase Constitution by 1, to a max of 20

-You can take 1 hit die Necrotic damage (cannot be modified in any way) then add that to your damage roll on your next attack. This amount increases to 2 hit dice at 5th level, 3 hit dice at 11th, 4 hit dice at 17th, and 5 hit dice at 20th level. You can do this twice before you must finish a short rest.