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Old 9th November 2008, 06:18 AM   #1 (permalink)
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Does cover prevent Opportunity Attacks?

Title says it all. But to clarify - If you stand adjacent to someone but have cover from them, does the cover prevent opportunity attacks if you use a ranged attack against the adjacent person?

We've been playing this way since 4th edition came out, but after trying to find the rule, it looks like we have been wrong on that.

I'm thinking we accidently ported over a 3.5 rule.
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Old 9th November 2008, 06:24 AM   #2 (permalink)
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Cover does not protect againts OAs. Total concealment does protect against OAs.
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Old 9th November 2008, 06:29 AM   #3 (permalink)
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yeah,

That was all I could find too.
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Old 9th November 2008, 06:31 AM   #4 (permalink)
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They (the designers) did say they were trying to make OAs easier to game with. Less stuff provokes, and there are fewer exceptions to the stuff that provokes.
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Old 9th November 2008, 06:53 AM   #5 (permalink)
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They (the designers) did say they were trying to make OAs easier to game with. Less stuff provokes, and there are fewer exceptions to the stuff that provokes.

Yeah I get that. I'm fine with the change. It's just an oversight on our part in switching from 3.5 to 4.
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Old 9th November 2008, 07:16 AM   #6 (permalink)
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Wow we've been playing that cover prevents OAs since we converted to 4th! This definitely changes a lot of things, as both players and DMs in my group were using tactics like walking through other allies' squares to avoid OAs. Thanks for pointing this out to me!
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Old 9th November 2008, 09:20 AM   #7 (permalink)
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Wow we've been playing that cover prevents OAs since we converted to 4th! This definitely changes a lot of things, as both players and DMs in my group were using tactics like walking through other allies' squares to avoid OAs.
Even in 3.5, this didn't work: "When you move through a square occupied by a friendly character, that character doesn’t provide you with cover."

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Old 9th November 2008, 06:00 PM   #8 (permalink)
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does cover / concealment stop OA?

We had an archer on a 5' ledge shooting at a guy adjacent but below him with a pointy stick (human rabble).
a textbook example of cover, should the minion get attacks of opportunity?

You throw 12 minions and a battlefield controller at a party with no wizard and its a pretty good fight. Especially since every time they killed a minion the minion got a free attack from the controllers inspiring aura.

Afterward there were sammwiches.
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Old 9th November 2008, 06:03 PM   #9 (permalink)
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Doh. Merge please.
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Old 10th November 2008, 12:57 AM   #10 (permalink)
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Old 10th November 2008, 01:01 AM   #11 (permalink)
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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!
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Old 10th November 2008, 05:04 AM   #12 (permalink)
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I was a bit surprised that superior cover didn't protect against OAs. I guess this was because of K.I.S.S. philosophy.
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Old 22nd November 2008, 07:15 AM   #13 (permalink)
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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.
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Old 22nd November 2008, 11:05 AM   #14 (permalink)
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Quote:
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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.
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Old 22nd November 2008, 10:16 PM   #15 (permalink)
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Quote:
Originally Posted by Alex319 View Post
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.
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Old 22nd November 2008, 10:32 PM   #16 (permalink)
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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.
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Old 24th November 2008, 10:50 PM   #17 (permalink)
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Quote:
Originally Posted by Alex319 View Post
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.
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Old 25th November 2008, 12:07 AM   #18 (permalink)
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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.
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