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Pathfinder Unchained

Skill Unlocks

Source Pathfinder Unchained pg. 82
Skill unlocks give characters new abilities and ways to use their skills upon reaching 5, 10, 15, and 20 ranks in a skill. Any character with the Signature Skill feat (see below) can earn skill unlocks for a single skill, and they are a prime feature of the revised version of the rogue from Chapter 1 (see page 20), who uses her rogue’s edge ability to gain skill unlocks for several of her most iconic skills. Alternatively, you might make skill unlocks a universal part of the game, but you should be aware they add significant power and flexibility to skills, so giving them for free to all classes would grant power boosts to other highly skilled classes such as the investigator and bard, particularly in comparison to the rogue. Another alternative is to eliminate access to the Signature Skill feat, limiting skill unlocks to rogues and rogues alone.

See Here for the skill unlocks.