Dragon's Gift45 books in series
Hidden Magic Publisher's Summary
Cass Clereaux is a FireSoul - one of the unlucky few to inherit a piece of the dragon's soul. It gives her a deadly, forbidden magic, but at least it helps her find treasure. The only people she can trust are her fellow FireSouls, Del and Nix. They hunt treasure to pay the bills and keep their FireSoul secret to save their lives.
When Cass is blackmailed by a criminal overlord who holds their lives in his hands, things get rough. He wants a pair of rare daggers hidden inside a deadly temple. If Cass and her friends don't get him the daggers, they're dead. But when they get into the temple, they realize that things are even worse than they'd imagined. What was supposed to be a normal job is decidedly...not. And surviving it might be impossible.