once per short rest you can use an action to switch to your second character sheet any amount of turns (with a risk) and you gain some occult looking markings across your entire body.

Any damage taken is shared between you both, as you share the same body, because of this you will also be the same level and share the same spell slots although you can pick a different race variant.

you will also only have 1 total amount of subclass unique spells (for example, if your subclass gives 2 u can allocate those 2 between 2 sheets (like 1/1 or 0/2)), and every time you gain new unique spells u can re-allocate the spells (even that one sheet gets 1 spell, or all lower level subclass spells, while the other sheet gains more/ the higher level spells, as the level does not matter for a subclass unique spell)

At the start of each turn (when you want to turn back) you have to roll a CON save (DC 10), for every 5 turns the difficulty increases by 5 (with no limit), but if you roll a natural 20 you automatically succeed, however if you fail the roll you cannot roll again until the turn after the next.

When you return to your own body you gain disadvantage on your next attack (both hit and damage roll), and have to roll a CON saving throw with a dc of 15, if you fail you lose all your actions and bonus actions of that turn.

You will also have to roll a CON save (DC 5) whenever you severely experience a "bad" emotion (examples being very angry, hateful (towards a specific person/current event, not just towards something like evil), etc.), if you fail this saving throw you will turn and the return DC will start at 15, and you don't lose your original 1 transform per short rest.