Emberdust

Emberdust is an ash-like substance that generates heat when moving, sometimes burning itself away to nothing. Usually byproducts of magical fire and dragonfire, it is incredibly light and thin, like regular ash, but it burns and glows slightly as it falls/floats. It frequently settles on the ground and begins burning again as it's kicked up by wind or by passing people/animals. When settled, it is not warm, but if picked up quickly, or moved quickly in any way, it can become very hot and burn itself away to nothing.

Used as a catalyst in alchemy, it tastes bitter, but warm and is apt for enhancing evocation magics.