Temporal Conduit

You establish a connection to your future self, which lasts for the duration. While this connection lasts, you can pull things through time from your future self to help you in your current situation, or give to your future self. As an action, you can send any of the following things through time.

Spell Slots. You gain or lose any number of spell slots of any levels, whose combined level is your spellcasting modifier or less.

Hit Points. You gain or loose any number of hit points, up to 20. 

Items. You loose any nonmaigcal item you posses. Alternatively you can gain or loose any number of gold pieces, up to 20. 

Features. You gain or loose a use of a limited use ability. For example a wizard could regain use of arcane recovery.

When the spell ends, you gain a level of exhaustion for each time gained something through use of this spell. This exhaustion cannot be cured by any means short of the wish spell. At any time as an action while you have this exhaustion, you can loose one thing gained through use of the spell to reduce the level of exhaustion by one. For example if you gained 40 hit points and a 5th level spell slot, you would have three levels of exhaustion. Then, the next day you could loose a 5th level spell slot to reduce the exhaustion to two.

If you lost anything through use of this spell, record what you lost. At any time after casting this spell, you can use an action to gain anything you lost. You can only gain each thing lost once.