If it hadn't been for the rumor that treasures were hidden in the abandoned fortress, Leon might not have chosen to seek trouble with the group of Orcs occupying it.
Yes, he wasn't too concerned about money, not like Mother Dragon who wouldn't even spare a copper coin for her own child, nor like Dragon Sister who treasured a silver coin immensely, but he didn't hate money either. If it came along the way, why refuse it?
Moreover, aside from money, there must be something else in those treasures... perhaps many Magic Items, a Magic Greatsword would be nice. If it were a bracer, he could wear it on his finger as a ring, otherwise, he probably couldn't use anything else; he couldn't wear helmets or armor, nor shoes.
The abandoned fortress was located on a small hill in a nearby forest, with dark trees surrounding its broken walls. Based on the goblin's information, Leon easily found the abandoned fortress without much effort.