Despite popular belief, the magical wood can be reached through other means than a "Ring of Other Worlds." However, needing a ring of many worlds to create, it still shows that maybe a better way could be present. Inasmuch as, the ring takes you to the wood and back, the door is always open to the other side, but only when called upon by this spell again can you return. Once into the magical wood, and you step out of the door, you start to see the door fade, and you have 1d4 turns to return to it without needing the spell. Once the spell has been cast once by the user, a ring is no longer needed to call upon the door.
The door is completely invincible, and cannot be dispelled, except by gods themselves. Not even deities can attempt to dispel it. However, the caster of the door can dissipate it at any time, and have the ring return to his pocket magically. The third, and last way to get rid of this door: have a world tree from the magical wood grow over top of it.
Casting difficulties: Every half hour the entity casting this spell, no matter what modifier, must roll a 1d20, and get higher than a 15 to continue the spell. At the end of the spell once the door is constructed, a thick magical essence is erupted from the caster's extremities, and one takes 2d20 damage.
* - (Ring of Many Worlds)