[sblock=OOC]Technically, I believe the swarm appears right before your next turn. See here. I have not (at least yet) found anything to indicate precisely when the summoned creature acts, but I think it makes sense for it to act immediately (putting it in initiative order right before Erdolliel, and giving it an action before she takes her next one). Does that make sense and/or do either of you know of (a) rule(s) that addresses it?
As for the swarm effectively eliminating invisibility, I believe that makes sense. The swarm literally has 0 reach, which means it must enter the square that the snake occupies. I believe it is safe to say that you can use that to "pinpoint" the square the snake is in. HOWEVER, I am disinclined to say that this would negate the snake's 50% concealment miss chance. See generally here regarding pinpointing and the concealment miss chance. Any thoughts on that?
Regarding Erdolliel's movement, I'm inclined to agree that she can go W, N, N, N, N, NE, but cannot make the final NE due to it being the second diagonal and squeezing.
I believe there is no concentration check actually needed unless something specifically happens that requires one. Otherwise, your concentration to maintain the spell is automatic (as long as you spend the standard action to continue concentrating). See anything that disrupts concentration while casting can disrupt maintaining concentration and list of things that force a concentration check.
Finally, while I will actually wait to make the "real" post, I will let you know (primarily so o3 can decide his action) that the swarm starts covering O right where O was before (i.e. O didn't move). But O passes the Fort save (13+) so it is not nauseated.
Did I miss anything?[/sblock]
As for the swarm effectively eliminating invisibility, I believe that makes sense. The swarm literally has 0 reach, which means it must enter the square that the snake occupies. I believe it is safe to say that you can use that to "pinpoint" the square the snake is in. HOWEVER, I am disinclined to say that this would negate the snake's 50% concealment miss chance. See generally here regarding pinpointing and the concealment miss chance. Any thoughts on that?
Regarding Erdolliel's movement, I'm inclined to agree that she can go W, N, N, N, N, NE, but cannot make the final NE due to it being the second diagonal and squeezing.
I believe there is no concentration check actually needed unless something specifically happens that requires one. Otherwise, your concentration to maintain the spell is automatic (as long as you spend the standard action to continue concentrating). See anything that disrupts concentration while casting can disrupt maintaining concentration and list of things that force a concentration check.
Finally, while I will actually wait to make the "real" post, I will let you know (primarily so o3 can decide his action) that the swarm starts covering O right where O was before (i.e. O didn't move). But O passes the Fort save (13+) so it is not nauseated.
Did I miss anything?[/sblock]