Planar Door

Casting a planar door spell opens a shimmering doorway between the caster and a randomly determined Outer Plane. It also might draw the attention of planar creatures nearby, which may choose to step through to the caster's location (10% chance).

The caster of the planar door spell has no control over which plane is contacted, but no control over what creature, if any, appears.

The door is an open portal between planes, though which any creature can pass without restriction or obligation. Creatures can pass in either direction until a number of creatures equal to the caster's level have passed through. The caster can close the door at any time, ending the spell. The casting ages a human caster one year (others 1% of the typical lifespan).

The material component is vial of ethereal plasma.