Time Paradox

You attempt to shift yourself into the recent past, taking the place of your prior self from up to 1d4 + 1 rounds before the casting this spell. Doing so however is taxing to you mentally and physically. When you cast this spell, make a DC 15 Intelligence saving throw. On a failure, you suffer one level of exhaustion and are insane for a number of rounds equal to the resulting d4 roll. While insane, you can't cast spells, can't understand what other creatures say, can't read, and speak only in gibberish. A greater restoration spell cast on you ends this effect.

On a successful save, any actions or events taken within the rolled amount of rounds cease to be as if they never occurred to begin with. You retain the memory of your prior timeline and can use that information to influence future events while other creatures do not.

Each time you cast this spell after the first, the DC increases by 5. When you finish a long rest, the DC resets to 15.