Crystal Arena machine idea

[RojjaCebolla]

This idea basically comes from Pixel Dungeon.

A room that can only be entered by jumping in from above. It contains one OOD monster and an item.

The walls are crystal or statue, so that players can see in. When you enter, the walls begin to dissolve, so that you have the option to grab the item and flee. But initially, you're trapped in there with the critter.

Terrain shouldn't be blank by default; occasional grass, tree, pillars, or even traps make each arena different.