
Mulet |
So I've got an invisible bard eluding a Rogue that is trying to kill him. The Bard must roll stealth to move about, but he is trying to put some distance between he and the Rogue.
The roll for stealth is:
+20 for Invisibility
+5 from skill ranks
-5 for moving the full 30ft instead of just 15ft
The bard however will summon Monsters next turn. What penalties to stealth does this bring?
The bard will then perform, inspire Courage. What penalties does this bring?

Nicos |
According to the table here
http://www.d20pfsrd.com/gamemastering/special-abilities#TOC-Invisibility
Speaking give a -20 penalty to the perception. Moving the full spelld give a -10. But add +1 to the DC for every feet that searates the bard from the rogue.
As a side note, note that summon mosnter is 1 round action but he could two consecutive standad for it if he wants to keep moving.

MurphysParadox |

Summon Monster takes a standard action to cast but one full round until it appears (casting time). You still get your move action for the round you start casting. The spell completes at the start of your next turn, so you get your normal set of actions on the second turn.
Casting time of 1 round is not a full round spell. You can't finish it the turn you started by using your standard and move action like a fighter can make a full attack.

Rastrum |

Summon Monster takes a standard action to cast but one full round until it appears (casting time). You still get your move action for the round you start casting. The spell completes at the start of your next turn, so you get your normal set of actions on the second turn.
Casting time of 1 round is not a full round spell. You can't finish it the turn you started by using your standard and move action like a fighter can make a full attack.
You're misreading that, it takes a full round action to cast a spell with a 1 round casting time, and it completes at the beginning of your next turn so you get all of your normal actions on the round casting is completed.

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casting = hear details of conversation: Perception DC 0
perception skill modifiers:
invisibility: Perception DC +20
distance: Perception DC +1 per 10 ft
invisibility condition modifiers:
in combat or speaking: -20
pinpoint: +20
so we have, let's say, an invisible bard casting summon monster at a distance of 30 feet (i.e. not moving due to 1 round casting time required by summoning), with the following pinpoint DC:
Total pinpoint perception DC = 0 + 20 + 3 - 20 + 20 = 23
(NOTE: the bard still benefits from 50% miss chance)

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if one just looks at the invisibility special ability section, it works out to be a little lower due to the "within 30 feet" handwaiving of distance:
"A creature can generally notice the presence of an active invisible creature within 30 feet with a DC 20 Perception check. The observer gains a hunch that “something's there” but can't see it or target it accurately with an attack. It's practically impossible (+20 DC) to pinpoint an invisible creature's location with a Perception check.
Invisible creature is... Perception
In combat or speaking –20"
So in that case we have, within 30 feet: DC = 20 + 20 (pinpoint) - 20 (in combat or speaking) = 20
(about 3 lower than the 23 from my previous post)

Mulet |
The Rogue is 45t away, so I'd round down yes? That puts it beyond your second set of working out, to be at 24 to pin-point.
The rogue has a perception of 12, which results in the Rogue having a 45% to spot the Bard.
Invisibility sure does suffer when one does a lot of fancy stuff! Thank you for helping me out.

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no problem! basically the base DC to notice an invisible creature is 20, but this 20 is cancelled if you're in combat or speaking, which becomes 0. Then you just have to remember that it's +20 to pinpoint, then +1 per 10 ft. distance. So yeah, invisibility for people fighting and casting is not impossible to beat. It's DC 20 to pinpoint plus distance modifier.
The true power of invisibility is reconnaissance. When using stealth, let's assume someone with a decent stealth of +10, the DC to notice this person is in the room is 30, and pinpointing that stealthy character is DC 50. If that same stealthy character is not moving, you need a DC 70 to pinpoint him or her.
So yeah, the moment that this DC 70 to pinpoint stealthy unmoving character takes a 5-foot step and swings a sword or cast a spell, assuming he's smart enough to make a stealth check, he goes from DC 70 to DC 30... taking a -40 to the perception DC. Actually he goes to DC 25 because stealth means he's moving at half speed and that's an extra -5 penalty... (although one could argue that the "stealth + 20" rule already includes movement, and maybe the movement penalties are meant for characters that are not using stealth?)