Void portal

You conjure a purple portal with a rippling edge linking an unoccupied space you can see within range to a precise location on the same plane of existence that is familiar to you. The portal is a circular opening, which you can make 5 to 20 feet in diameter. You can orient the portal in any direction you choose. The portal lasts for the duration.

The portal has a front and a back where it appears. Travel through the portal is possible only by touching its front. Anything that does so is instantly turned into void magic, being sucked into the portal and appearing in a burst of void energy in the unoccupied space nearest to the other portal.