After rescuing unicorns, finding a bag of 27 horns from their slaughtered brethren, scared to the herd, the party thief insisted that was the ward he demanded for their lives.
They'd already offered "anything we asked." He demanded all the horns.
A fighter in the party commented: "It's up to you, but with all the bad stuff running around out thee, it strikes me that carrying a bag of two dozen unicorn horns is almost as bad an idea as your last brainstorm of using a wish to bind an ancient Red Dragon to your service. Now I could be wrong, but if you're really going to do that, then you head North and the rest of us are going to head South, and best of luck to you."