[Endoperez]

Ethereal - combat monsters if they use any kind of armor, ESPECIALLY the commanders.

Stealthy (esp. with flying) - awesome tactical mobility and raiding capability.

Glamour (esp. with flying) - your opponent won't know where your forces are, or where your best mages are, unless you're already fighting. It also helps them a lot in combat.

Personally, I can see djinn having either stealth or glamour, but I'd be careful with any one djinn having both.