Portals are magic teleportation devices that allow a user to leave one hex and enter another instanly.
The only known portals connect to the Magic Kingdom. One of these portals is known to connect to Gobwin KnobErf-b1-p013 and it did survive the Volcano Uncroaking.Erf-b1-p142 The City of Unaroyal also possessed a portal to the Magic Kingdom before its fall.
It seems using a portal doesn't follow the classical Movement rules since it would disallow using one by night or off Turn.Erf-b1-p046 Yet, the linked Maggie-Wanda-Sizemore and Parson use Gobwin Knob's portal to the Magic Kingdom during the turn of the Royal Crown Coalition.Erf-b1-p136 They then return to Gobwin KnobErf-b1-p142 a few moments before the start of their turn.Erf-b1-p144 Also, a unit of another side is shown using a portal during Gobwin Knob's turn.Erf-b1-p013 In addition, using a portal must not cost the portalling unit any move, as Parson, with a move of 0, is able to use one without any of the problems associated with crossing hex boundaries. Likewise, the casters left in the Coalition's turn, so they would not be otherwise able to leave the hex.