I have a power system for a book I'm writing called Color Weeping. Essentially, there's a stone that's essentially crystallized light essence called Tearstone. It's normal stone, unless effected by something called Emotion.
In the world of Glowdrop, emotions can take on physical form in the form of Emotion, a sort of technicolor liquid. Most people, however, cannot access this Emotion normally. A certain sect of people, however, upon touching the pure version of Tearstone, a Glowdrop, can activate latent powers known as Emotional Levels. They can then, whenever feeling emotion, can release a specific amount of Emotion relative to their Emotional Intensity, and put it into Tearstone, giving it a variety of different effects depending on the structure of the Tearstone construct.
However, once a certain emotional maximum is reached, a power is granted. This is mostly random, and there are four total unique powers.
Sadness, which is Blue Dampening, covers a target in a blue aura that dampens their Emotion usage. Sadness users are called Dampeners
Happiness, which is Red Enhancing, covers a target in a red aura that increases their Emotion usage. Happiness users are called Growers
Love, which is Green Dispersion, turns the user's their Emotional storage into separate green energy orbs that can be given to others for extra Emotion. Love users are called Givers
Hate, which is Yellow Redirection, turns parts other people's Emotional storage into yellow orbs that they can take for themselves for extra Emotion. Hate users are called Thieves.
Some example Tearstone usages:
Tearstone Blades, which are essentially swords. Charged with Emotion, they are up to ~six times as strong as an ordinary sword
Tearstone Bullets. These bullets can be fired from most guns, when charged with Emotion they are blindingly fast.
Emotion Distillers are Tearstone cylinders powered with excess Hate energies, they can take raw Emotion away.
And many more!