X-Ray

This spell is truly useful if the hidden has to be laid to the open. With walls, mountains, etc. blocking the line of view, this spell enables the caster to simply look through them, as if they are made of glass, for a short time. Very useful for finding secret doors and passages. The white potions originally had the same effect.

Both the spell and potion were outlawed after an infamous peeping-tom scandal at 207 A.E.

Trivia

 * The true reason why this spell vanished by Ultima VII is actually, that the game engine was a permanent X-Ray, making the spell and potion useless.