Spelljammer
Locate Secret Openings
A person with this skill is able to more readily discern irregularities in surfaces that could lead to secret or concealed openings.

The base chance to find a secret door or opening is equal to 2x PER on percentile dice. This assumes that the character is actively looking for a secret door and spends 10 minutes searching a 20 foot long section of wall. Each rank with this skill adds one to the character's PER roll for the purpose of finding a secret door.

Additionally, the character has a chance to notice a secret door even if he is not looking for one if his rank with this skill, plus his PER, is 16 or higher. He must pass within 10 feet of the surface that conceals the secret door and Notice Secret Door roll (c.f., Characteristics). Note that the character's rank with this skill, plus his PER, cannot exceed 35. Thus, if he has a PER of 25, he cannot have more than 10 ranks with this skill.