Living Light Generation: Dagger generates a form of 'living light' which is actually lifeforce. 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 lifeforce 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. When inverted by Mister Negative, Dagger draws her powers from the Darkforce, but they are otherwise identical, save for her daggers causing additional pain.

Light Daggers: Tandy can form 6-inch 'light daggers' which she can throw from her fingertips. Her daggers may automatically form under certain conditions, such as another person in danger. The maximum effective range is unknown, but the daggers seem to weaken with further distance. Tandy has a limited ability to control their flight and reinforce them by compelling them to seek targets. They can track a being, but it is most effective when searching for Cloak. Those hit by these knives have their own lifeforce disrupted. Dagger can then drain a portion of their lifeforce; enough to kill if she wishes. Normally she chooses to leave them in a state of shock where they will see a vision of how their life might be different. The experience is powerful enough to make most individuals rethink their choices, although a hardened criminal or evil being is unlikely to change their ways.

Living Light Detoxification: Tandy's energy can also 'purge' a person, removing toxins, drugs, and other malignant substances from their system. It also has the capacity to cure certain persons of drug addictions.

Living Light Manipulation: Sometimes Tandy can redirect the daggers after they ricochet, other times the daggers are dispersed if they hit a non-living thing. She can project her lifeforce energy in a diffused manner, allowing her to illuminate dark areas as if by natural light. Tandy can also projects her 'light' into Cloak's dimension to feed his 'hunger.' She is unharmed when traveling through his dimension and can pass this protection to others.