Ethereal Transit

You call on the supernatural state of the Ethereal and command passage. At the end of casting this spell, you vanish from your current plane of existence and appear in the Ethereal Plane (the spell fails and the casting is wasted if you were already on that plane). For the duration of this spell, the border between planes is paper thin to you, allowing you to hop in and out of the Ethereal Plane at will as a bonus action. The plane you exit the Ethereal Plane onto is the plane you originally cast the spell from. If you are on the Ethereal Plane when the spell ends, you are forced out and appear in the closest unoccupied space on the plane the spell was cast from.

While on the Ethereal Plane, you can see and hear the plane you originated from, which is cast in shades of gray, and you can't see anything there more than 60 feet away. You can only affect and be affected by other creatures on the Ethereal Plane. Creatures that aren't there can't perceive you or interact with you, unless they have the ability to do so. Also, gravity is essentially non-existent here, therefore you gain a fly speed equal to your walking speed while on this plane. You can also pass through solid objects with your ethereal form, treating things such as walls, doors and other solid materials as difficult terrain, with the exception of living creatures.

This spell ends early if you lose concentration on the spell, cast a different spell requiring concentration, fall unconscious, or end the spell as an action.