The Substantive Charm (Incantation unknown) was a spell of unknown effect.
Behind the scenes
- Given that the word "substantive" means 'solid' or 'existent', it is likely that this spell has such a use; it might possibly be used to solidify ghosts, hurting them in a similar way to Skurge. However, there is no evidence aside from the name to prove this.
- It is also possible and perhaps more likely given the context in which "Substantive Charm" was mentioned that a Substantive Charm is a class of spells that can be used without any prerequisite spell being used (see this article's talk page for an explanation why this may be true.
- Harry Potter and the Order of the Phoenix (Mentioned only)