concentration, 5 minutes/mana
As two actions, you create two linked teleportation portals in unoccupied spaces you can see within 100 meters of you that remain open for the duration. A circular portal, 2 meters in diameter, opens over each point.
The portals are two-dimensional glowing rings. When you cast this spell, choose whether both sides operate as a portal or if only one side does.
Any creature or object entering a portal exits from the other portal as if the two were adjacent to each other; passing through a portal from a nonportal side has no effect.
As an action on your turn, you can rotate the rings of each portal to activate or deactivate it.
The portal is stable enough for energy such as alchemical explosions or magic to pass through it.
You can expend 1 additional mana to increase each portal’s diameter to 10 meters.
You can expend 2 additional mana to increase each portal’s diameter to 50 meters.