Couple questions from a new GM

[GarrinB]

So I'm preparing for my first adventure and am going through the rules for possible circumstances I may encounter and a couple of things came up.

1. Grapple. When a player makes a grapple attempt, and provokes an AoO, does anything happen to the player should they be hit?

I ask because I have this SORD PF quick reference page that says that you subtract the damage they take from their grapple attempt roll. However I don't see that in the rules.

2. Stealth. Coming from 4E, stealth checks by monsters could simply be make against the players passive perception. However I'm not totally clear on this works in PF. If a player say enters a room and there is a creature hidden, must I always ask the players to make a perception check first? They may initiate one anyway, but if they don't, I wouldn't want to clue them in on the fact that something was trying to hide from them.

Thanks!

[Adam Christman]

I don't recall about the Grapple question, but for your second question, just make the perception rolls yourself.

Before play, get their Perception bonuses from them and have them written down where you can use them to make any/all secret Perception rolls. Makes it super easy.

[Patryn of Elvenshae]

GarrinB wrote:

1. Grapple. When a player makes a grapple attempt, and provokes an AoO, does anything happen to the player should they be hit?

I ask because I have this SORD PF quick reference page that says that you subtract the damage they take from their grapple attempt roll. However I don't see that in the rules.

The line you're looking for is part of the general rules for combat maneuvers:

PF SRD, Combat, Combat Maneuvers wrote:

Unless otherwise noted, performing a combat maneuver provokes an attack of opportunity from the target of the maneuver. If you are hit by the target, you take the damage normally and apply that amount as a penalty to the attack roll to perform the maneuver.