Acrobatics
With sufficient ranks in*Acrobatics, you earn the following.
5 Ranks: You can move at normal speed through a threatened square without provoking an attack of opportunity by increasing the DC of the check by 5 (instead of by 10). You aren't denied your Dexterity bonus when attempting*Acrobatics*checks with DCs of 20 or lower.
10 Ranks: You can attempt an*Acrobatics*check at a –10 penalty and use the result as your CMD against trip maneuvers. You can also attempt an*Acrobatics*check at a –10 penalty in place of a Reflex save to avoid falling. You must choose to use this ability before the trip attempt or Reflex save is rolled. With a successful DC 20*Acrobatics*check, you treat an unintentional fall as 10 feet shorter plus 10 feet for every 10 by which you exceed the DC, and treat an intentional fall as 10 feet shorter for every 10 by which you exceed the DC.
15 Ranks: You do not provoke attacks of opportunity when standing up from prone.
20 Ranks: You double the result of any*Acrobatics*check when jumping and never fall prone at the end of a fall as long as you remain conscious.
Escape Artist
With sufficient ranks in*Escape Artist, you earn the following.
5 Ranks: If you take a –10 penalty, the time required to use this skill is halved; escaping a grapple or pin is a move action, and escaping a net,*animate rope,*command plants,*or*control plants*spell is a standard action.
10 Ranks: You can attempt to escape from any entangling effect as a standard action with an*Escape Artist*check (DC = the effect's save DC + 10). You can attempt an*Escape Artist*check as a move action to set the DC for a creature to escape from ropes or bindings; you gain a +10 bonus on the check if you instead attempt it as a full-round action.
15 Ranks: You can escape any entangling effect (as above) as a move action. As a standard action, you can attempt an*Escape Artist*check (DC = the effect's save DC + 20) to suppress a*slow*or paralysis effect for 1 round, plus 1 round for every 5 by which you exceed the DC. This action counts as purely mental for the purpose of being able to take it while paralyzed.
20 Ranks: You can escape being entangled, grappled, or pinned as an immediate action with an*Escape Artist*check (DC = the effect's DC + 10 or the attacker's CMB + 10). You can attempt to suppress a*slow*or paralysis effect as a standard action (increasing the DC by 10), a move action (increasing the DC by 15), or an immediate action (increasing the DC by 20).
Perception
With sufficient ranks in*Perception, you earn the following.
5 Ranks: You remain alert to sounds even in your sleep, and the normal DC increase to*Perception*checks when you are sleeping is halved. The distance modifier on the DC of*Perception*checks you attempt is reduced to +1 per 20 feet.
10 Ranks: The distance modifier on the DC of*Perception*checks you attempt is reduced to +1 per 30 feet. In addition, you gain a +5 bonus on*Perception*checks to notice or locate an invisible creature or object.
15 Ranks: You remain alert to sounds even in your sleep, and the normal DC increase to*Perception*checks when you are sleeping doesn't apply to you. The distance modifier on the DC of your*Perception*checks is reduced to +1 per 40 feet.
20 Ranks: You gain a +10 bonus on*Perception*checks to notice invisible creatures or objects. The distance modifier on the DC of*Perception*checks you attempt is reduced to +1 per 60 feet.
Stealth
With sufficient ranks in*Stealth, you earn the following.
5 Ranks: Reduce the*Stealth*penalty from sniping by 10.
10 Ranks:*Stealth*check penalties for moving quickly are halved, including the ability unlocked at 5 ranks, moving full speed, and reaching concealment after creating a distraction.
15 Ranks: If you attack after successfully using*Stealth, your target is denied its Dexterity bonus against all attacks that you make before the end of your turn.
20 Ranks: If you attack after successfully using*Stealth, your target is denied its Dexterity bonus against all attacks that you make before the beginning of your next turn.
http://paizo.com/pathfinderRPG/prd/u...llUnlocks.html