User can drain anything

Pros:
-user can drain energy from whatever they touch
-user can drain life, necessary nutrients and other things
-user can drain via touch

Cons:
-user stores whatever they drain in their body
-user drains whatever they touch and cover themselves
-user has little control over what they drain
-user will damage their body if the drain a lot of harmful things

Weakness: draining life
User extends their own life and kills whatever they hold