Marvel: Living Light Generation

Tandy Bowen (Dagger)
Dagger generates a form of 'living light' which is actually life-force. She produces much more than normal humans do, but is usually conservative in the use of her powers. Overuse of her powers could be fatal. Dagger generates and stores this life-force energy automatically. If she goes for more than a week or so without using her powers, she will become fevered and delirious, and eventually discharge her energy involuntarily.