You use them the same way nondamaging illusions have always been used.
If you can't come up with a dozen more uses by yourself, you're not really trying.
- Make yourself look tougher than you are. If you have a huge troll for a bodyguard, many enemies will think twice about trying to attack you.
- Nonintelligent monsters are easily distracted. When a pack of dire wolves shows up in the middle of the night, let them attack a nice, juicy cow, while you wake your friends and ready weapons.
- Conceal traps or natural hazards under illusionary objects-- like a carpet over a pit. Stand on the far side and let your foes fall in. Giggle.
- When you're being chased by enemies, get out of their immediate line of sight and find a door. Stick an illusionary bookcase in front of it, and then run through. If your pursuers fail their saves, they won't know where you've gone.
- The old Wizard's Gold trick. "Hi there, Mr. Ogre! I'll give you this huge bag of money if you help us kill the goblins in the cave next door."
- Control the battlefield by creating illusionary hazards. If you can throw up a wall of flame or a deep chasm or a huge thornbush, you can stop the bad guys from flanking your party members.
If you can't come up with a dozen more uses by yourself, you're not really trying.
