Near Ruthens Falls there was a natural bowl in the side of a rocky hill. Over the years, the bowl was converted into an outdoor amphitheater and further structures were added around the perimeter, including some dug into the side of the hill proper.
Now overgrown, local rumours attribute the stepped-side bowl in the side of the hill to being the leftovers of a great battle between two fallen warlords of chaos, where the ground shifted around them forming what appear to be moss-covered stone stairs but which are supposedly ripples caused by the shockwaves of fell magics.
The Colliseum at Ruthens Falls was drawn in the Holly King mapping book (a dollar store notebook) using a 0.5mm gel pen in a single draft. Non-commercial use in your home games is of course encouraged, and further non-commercial use in your blogs (stock it, damn it!) is not only encouraged, but I’ll try to link to what you do with it.