If the effects are controlled by a character instead of being random, that's a Green Lantern Ring. These Green Rocks, in addition to functioning as Clark Kent's Kryptonite Factor, have been known to: give people random superpowers, turning them into the Monster of the Week help people recall memories make cars go faster and send a phone call back in time, among many other things.
The name refers to the Kryptonite meteor rocks used in almost every episode of Smallville, most often in the early seasons. This occasionally ties in with Elemental Rock-Paper-Scissors, with each color variation attuned to a different classical element. If an actual substance, a common variation is to have it come in different colors, each with a varying set of effects.
An object or technology with powers so diverse and magical that it can cause almost any effect as needed by the plot.
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