Sal is an information dealer in Telluria. He usually likes to trade information for information, but he's been known to pay talented people to collect info for him, or take a bundle of cash in exchange for a tip.
He collects information, you see.
Sal is actually a dragon - a Brosba dragon if you remember them - the dragons that can absorb other creatures to steal their knowledge. Sal doesn't like to engage in this sort of thing, really he likes a fair deal - but sometimes people hold back things that he just HAS to have, and if they're not willing to give it up, well, they get added to the archives, if you know what I mean.