Incendium or the Fire-Making Charm is mentioned only once, when Harry is attempting to find Hermione Granger and Hagrid (canon) is blocking his exit. Susan Bones uses Incendium on his beard and it ignites, then knocks him over by making the floor slick with Glisseo (canon). (Ch. 88) It seems that the caster conjures a small flame wherever their wand is pointed. May be the same spell as the canon Incendio.