Lost Heroes' Skeletons

This is it.

The skeletons or skulls that stay in the place where their owners died. The skeletons might still have their gear equipped or at least nearby as, unlike the body itself, they don't rot away in time quickly. The Lost Heroes' Skeletons are caused by World Generation in places that are dangerous, such as The Villain's Lair or The Dragon's Den, a way to Put Skulls On those listed places. A possible backstory to the Lost Heroes' Skeletons is that their owners, in their last moments of life, attempted a Final Challenge that proved to be too difficult to be completed.