Flare is a Slizer element.
The Flare element developed after the mutants arrived. Because that is so, not much is known about it or it's abilities. It is similar to the Fire element.
Most users of the Flare element are able to conjure fire and withstand intense heat conditions, much like the Torch element users. The Flare Slizers themselves are masters of the element, and can use it for much more complex duties.