Warp portals, like warp scrolls, provide a one-way teleport to any location, provided it is in the same dimension. To construct a Warp Portal, build a frame from Sourcestone or its variants in the shape of a rectangle and provide a full Source Jar nearby. Then, throw a warp scroll with a written location into the frame. Given there is enough source nearby, the portal will be created.
Portals can be built horizontal or vertical, from 1x1 to 21x21 in size. Warping does not cost any source after creation. Using a Dominion Wand on the portal will change the texture of the portal.