The watchtower is obviously the den of some very large predators. Bones litter the ground around the hill and the whole area stinks of ammonia.
Two chimeras immediately engage the party but are quickly dispatched. While searching the area, the party locates a basement that has been undisturbed for over a century. Inside are several dusty books, a chest of coins, and two inanimate mechanical humanoid bodies.
The party hauls these objects (plus some portions of the chimera bodies that seem likely to yield alchemical components) back to the main camp.