Spell: Glyph of Betrayal (Patreon)

Intended as an insidious trap that is places inside a book, this spell causes the one who sees it to eventually attack their own ally, but then they can truthfully deny any memory of making the attack.

This was inspired by someone at a gaming convention who gave me three words to use as inspiration: grimoire, glyph, and false flag (yes, this one is two words, but I didn't correct them at the time).