Dreamwalk

You possess an alternate version of yourself, living or dead, on another plane of existence. You gain control of their body and mind, although you cannot access their past thoughts or memories.

During the time required to cast this spell, you search for any planes of existence where an alternate version of you exists. After the casting time, these planes are revealed. The spell takes effect once you choose a version of yourself to possess.

When you possess the alternate version of yourself, you lose control of your own physical self and become unconscious. You are unaware of any damage caused to your physical body while under the effects of this spell. If the body you possess is destroyed or reduced to zero hit points, the spell ends immediately. If your physical body drops to zero hit points, the body you possess falls unconscious, but the spell does not end.

While in control of the body you possess, you can use an action to end the spell and return to your physical body, which also happens when the spells duration ends.

When the spell ends, you must succeed on a wisdom saving throw or trigger an incursion. The save DC is equal to 10 + the number of minutes (rounded down) the spell was used for. If you fail the saving throw and trigger an incursion, the plane you cast the spell from and the plane on which the possessed body originated from collide. Both planes are annihilated, killing everyone on them.

At higher levels

When you cast this spell with a spell slot of 8th level or higher, the maximum spell duration increases by 1d4 minutes for each level above the 7th.