Quote Originally Posted by Azelor View Post
It's good for a modern campaign but for a medieval one, they should look more ancient. I mean, they would look too clean for the era.

And what is a one-way door ? Some sort of trap ?
One-way doors have many ways of being implemented. Say a magical/scientific portal that goes one-way, a trap that when triggered bars the door, the other side of the door has no handle/functional mechanism to open from that side, trap triggering a cave-in, or a turnstile, just to name a few. Basicall think of it as a one-way mirror, but instead of light, physical matter goes through it.