Ethereal Travel

You must target an object within an arm's length that is under 40 kilograms of weight. Once done so, you must tear through air to open a rift to the aetherial plane. Once an object or creature has entered the portal, the portal will close and not open until a duration of 2 rounds has been met. Portals can be opened from the aetherial plane. A portal can be opened no more than 50 ft from the targetted object. to connect to a previous portal. However, if the targetted object is destroyed, any object or creature sent into the rift will materialize into the physical plane, the materialized creature must make a Constitution saving throw or take 3d4 force damage, if the saving throw is successful, take only 1d4 damage.  At level 10,  the damage received is only 2d4 if failed, and 1d4 minus 1 damage if succeeding.