"Don't let anybody else see them until you see Mister Doomlord strutting about with his fancy new artifact!  After that, I'm sure you can figure out what to do."

"The +6/+6/+4 headband is on indefinite loan.  But we'll need the +4/+6/+6 back after the trip to the City of Brass - which we'll be joining you on!  And then we get the treatment that Mister Doomlord plans for himself once we're there!  You can consider that the price of the headband's loan, I suppose, though really I'd just like to call it a friendly trade of favors."

"Also after that trip, besides taking the second headband back, we'll want a couple hundred of the extra-large-sized gemstones from Mister Doomlord's hoard, just in case we end up needing those on hand."

"Don't let anybody else see them until you see Mister Doomlord strutting about with his fancy new artifact!  After that, I'm sure you can figure out what to do."

"The +6/+6/+4 headband is on indefinite loan.  But we'll need the +4/+6/+6 back after the trip to the City of Brass - which we'll be joining you on!  And then we get the treatment that Mister Doomlord plans for himself once we're there!  You can consider that the price of the headband's loan, I suppose, though really I'd just call it being mutually friendly about a matter of mutual interest."

"Also after that trip, besides taking the second headband back, we'll want a couple hundred of big shinies from Mister Doomlord's hoard, just in case we end up needing those on hand."