Invisible opponents.

[Bagpuss]

What happens when someone tries to move into the square of an invisible opponent?

What happens when a Fighter or Paladin correctly target the right square, can they mark the invisible opponent?

Do invisible opponents provide cover for their allies?

Does an invisible ally count for abilities that depend on having adjacent allies, even though you could be completely unaware they are there?

 

[Kordeth]

What happens when someone tries to move into the square of an invisible opponent?

They can't move into that square and they know an invisible creature is there. If the invisibility is merely being hidden thanks to a Stealth check, the creature is no longer hidden from that character.

What happens when a Fighter or Paladin correctly target the right square, can they mark the invisible opponent?

Yes.

Do invisible opponents provide cover for their allies?

Yes.

Does an invisible ally count for abilities that depend on having adjacent allies, even though you could be completely unaware they are there?

Unless the power explicitly says "adjacent alkly you can see," yes.

 

[sukael]

Keep in mind that as per the errata, you know the square an invisible creature is in unless they actively make Stealth checks. (Which they can do at any time due to having continuous total concealment, but...)

 

[Bagpuss]

What errata I've check the Updates for "invisible" and couldn't find anything.

Ah they have updated the update again..

 

[sukael]

What errata I've check the Updates for "invisible" and couldn't find anything.

Ah they have updated the update again..

http://www.wizards.com/dnd/files/UpdatePH.pdf

Page 10.

 

[deleteme123456]

They can't move into that square and they know an invisible creature is there. If the invisibility is merely being hidden thanks to a Stealth check, the creature is no longer hidden from that character.

How could this actually arise without teleportation? If the creature is stealthed and in an adjacent square that you can move to with a single move (if it's not adjacent, you aren't trying to enter its square yet), then you would (it seems to me) have unbroken line of site to it (aka it has no cover or concealment from you), which would break stealth at that point, before you even try to move into it.

 

[Saeviomagy]

How could this actually arise without teleportation? If the creature is stealthed and in an adjacent square that you can move to with a single move (if it's not adjacent, you aren't trying to enter its square yet), then you would (it seems to me) have unbroken line of site to it (aka it has no cover or concealment from you), which would break stealth at that point, before you even try to move into it.

A quick read of some of the rogue utility powers will show you a bunch of ways that this might occur.

 

[Rerednaw]

Marking?

PH 76 fighter combat challenge "...when you attack an enemy."

PH 281 Attacking what you can't see:"Choose a square to attack,"

So mark or not? You are attacking a square, not an enemy.

Also does becoming invisible or hidden void the mark?

 

[DracoSuave]

How could this actually arise without teleportation? If the creature is stealthed and in an adjacent square that you can move to with a single move (if it's not adjacent, you aren't trying to enter its square yet), then you would (it seems to me) have unbroken line of site to it (aka it has no cover or concealment from you), which would break stealth at that point, before you even try to move into it.

You move into total cover and/or concealment, then take another move action that doesn't cause you to leave cover/concealment?

PH 76 fighter combat challenge "...when you attack an enemy."

PH 281 Attacking what you can't see:"Choose a square to attack,"

So mark or not? You are attacking a square, not an enemy.

Also does becoming invisible or hidden void the mark?

Failing to guess the square an enemy is in causes you to miss the enemy. It does not cause you to not attack that enemy. Combat Challenge keys off of attacking an enemy. Choosing a square is part of that process.

 

[mneme]

How could this actually arise without teleportation?

Invisible creatures have total concealment. That's what invisibility does.

So despite having an unbroken line of sight to an invisible creature, it still retains stealth, as it has not lost concealment.