Ethereal Gate

You create a 5ft radius circular portal somewhere within range, and arcane runes are temporarily burnt onto the ground around it for 2d10 days. This portal allows Medium or smaller creatures to travel between the Material and Ethereal planes. Any Medium or smaller creature that starts its turn in the Material and moves over the portal's space is immediately teleported to the Ethereal, and vice versa. After plane shifting in this way, a creature has disadvantage on all attack rolls, saving throws and ability checks until the end of their next turn. As a bonus action on your turn, you can move the portal up to 30ft in any direction, and the runes move along with it. If you move the portal onto another creature's space and they are Medium or smaller, they sink into it. Once dispelled, the circle ceases to act as a portal but the runes remain.