For the purposes of determining a Perception Check penalty / bonus when pinpointing an invisible creature, could I get some clarification as to what is meant by 'in combat'?
Would an invisible mage casting a spell (from within combat) with only somatic components (no verbal) and not taking a move action apply the +20 Perception Check DC for non-movement, or does the movement of casting violate that?
In the following scenario, what would be the Perception Check DC to pinpoint the invisible creature? (Please break out the modifiers so I can follow along, if you don't mind)
A mage casts Invisibility prior to combat. Combat ensues. Mage is casting Summon Monster from within 30 ft. of enemy. Mage is not moving. Enemy wants to use Perception to pinpoint where mage is.
I am about to introduce Invisibility into my game and I've never had to deal with it tactically. I was hoping that the players around here could give me some examples of how invisibility can be properly used from a Wizard point of view, and what might need to be avoided to minimize rules misunderstandings.
Thanks,
Yves