They had enough money to buy gear for everyone. They were able to get Deravan's katana and Dorisma's orb right away, but the rest of the weapons wouldn't be ready until the next day. Deravan suggested that they leave now, since the dragon might not last that long.
"I agree with Deravan." Trey said. "We don't know how much time that dragon has left. Besides, all we're doing is going in, getting a sample, and coming back. It shouldn't be too difficult compared to some of the other things we've done."