The Ogre Mage can cast Invisibility at will as a spell-like ability. Can he cast it on his allies? I'm looking mostly for errata or precedent (FAQ/Sage/Module/Whatever) about whether the Ogre Mage's ...
Does a simple casting of Detect Magic reveal the presence of magical invisibility?
I'm pretty sure that even if you're greater invisible and cast say, a lightning bolt, while you stay invisible per the spell, that the spells effects are still visible. I can't find a rule citation ...