Does cover prevent Opportunity Attacks?

[Plane Sailing]

Cover does not protect againts OAs. Total concealment does protect against OAs.

As a rule that seems a little mad to me. Someone is the other side of an arrow slit and moves away and I get an OA against him? I'm going to be houseruling in 3e behaviour for this situation for certain.

After all, cover is rubbish enough as it is in 4e (only -2/-5), I'd like there to be *some* reason for using it!

 

[Nail]

I was a bit surprised that superior cover didn't protect against OAs. I guess this was because of K.I.S.S. philosophy.

 

[Alex319]

How do you get cover against someone that is adjacent to you?

Remember that you determine cover the following way:

1. The attacker chooses a corner of his square.
2. The defender chooses a corner of his square.
3. If the line between points (1) and (2) crosses a barrier, the target has cover.

If the attacker is adjacent to the defender, this means one of the attacker's corners is coincident with one of the defender's corners. So the attacker can choose that corner, and whichever corner the defender chooses, the line is completely in the defender's space, so there is no cover.

 

[Majoru Oakheart]

How do you get cover against someone that is adjacent to you?

If the attacker is adjacent to the defender, this means one of the attacker's corners is coincident with one of the defender's corners. So the attacker can choose that corner, and whichever corner the defender chooses, the line is completely in the defender's space, so there is no cover.

In addition the section on cover says "When making a ranged attack...". There is no cover from melee attacks ever.

 

[Plane Sailing]

How do you get cover against someone that is adjacent to you?

Remember that you determine cover the following way:

1. The attacker chooses a corner of his square.
2. The defender chooses a corner of his square.
3. If the line between points (1) and (2) crosses a barrier, the target has cover.

If the attacker is adjacent to the defender, this means one of the attacker's corners is coincident with one of the defender's corners. So the attacker can choose that corner, and whichever corner the defender chooses, the line is completely in the defender's space, so there is no cover.

Shoot through an arrow slit or similar fortification.

 

[Nikosandros]

In addition the section on cover says "When making a ranged attack...". There is no cover from melee attacks ever.

Take a look at page 43 of the DMG. There is indeed cover from melee attacks and the rules are somewhat different.

 

[Nail]

How do you get cover against someone that is adjacent to you?

Remember that you determine cover the following way:

1. The attacker chooses a corner of his square.
2. The defender chooses a corner of his square.
3. If the line between points (1) and (2) crosses a barrier, the target has cover.

The above method of determining cover is not entirely true. You need to draw a line from every corner, not just one.

 

[Nikosandros]

The above method of determining cover is not entirely true. You need to draw a line from every corner, not just one.

In melee one line is sufficient for cover.