Not sure if I am handling this correctly.
Scene
1 monster with 15ft reach, 3 squares including the one he is in?
When an PC moves to him and stops 2 squares, he is is attacked by attack of opportunity since the monster has reach?
What if the PC closes all the to the monster, either full move or charge. Does the monster get opportunity attack on the PC before he gets to him?
1 monster with 15ft reach, 3 squares including the one he is in?
15' reach means three squares outside of it's own.
[M] [1] [2] [3]
M is Monster, 1 is 5' away, 2 is 10' away, 3 is 15' away.
When an PC moves to him and stops 2 squares, he is is attacked by attack of opportunity since the monster has reach?
If a creature leaves a threatened square without taking a 5'step or withdraw action, it provokes an attack of opportunity.
What if the PC closes all the to the monster, either full move or charge. Does the monster get opportunity attack on the PC before he gets to him?
As above, but note you only provoke once for movement. If a character attempts to leave square 3, in any direction, Monster can take an AoO. If the PC leaves square 3, then square 2, and ends his movement in square one, he only provokes once, even if the monster has combat reflexes. It's the Monster's choice to attack him in either square 3 or 2.
thanks