Originally Posted by
Beheld
1) He has Persistent Image at will. So he has hundreds of images up whereever he is and several places he isn't.
2) It's an SLA so you literally get no possible chance to identify it being cast. Nor can you spellcraft it until after you have made the save.
3) You don't get a save unless you interact with it, something the Halfling won't be doing.
4) You have to know that waiting is useful, you don't, and if you do, he can literally fireball you infinitely while you wait, and refresh it with a single standard action from behind it.
5) Seeing a Persistent Image or an army of minions tells you absolutely nothing. It doesn't even tell you there is another enemy besides the mummies if you saw both, not that you can realize the image at all. Because any mummy could have class levels and have cast the image themselves.
6) Anthro's fighter literally doesn't even have spellcraft (last time I checked the build) because he had 3 skills, and those are cross class hide, MS, and Spot.
7) The Pit Fiend probably has Persistent Images of: 1) Fake cover that he can see through but you can't, 2) Fake walls that he can see through but you can't, making up pretty much any structure he wants, 3) Literally a texture map of the sky for a mile around, possibly texture map of the ground from above, giving him a gap to sit in, he can again, see through, but you can't. Several fake necromancers in the mummy horde or some other likely target to trick enemies into attacking.
Depending on the enviroment, might have more, less, or some other things.