To make things explode.
Molecular Combustion is the power to stimulate the molecules of an object or a person so much so that it will cause said object or person to combust to the point of explosion.
- Freya caused wine glasses to explode in Marilyn Fenwick, R.I.P.
- Freya caused a tea cup to explode in Pilot.
- Joanna blew up Freya's manacles in The Brothers Grimoire.