This is an RPG or DnD style map of a building I invented, as would be used in a table top gaming or perhaps an architectural rendering for an up-close event.
Himmelsteinkirche — Heaven’s Stone Church. It used to be a great abbey, but after it was hit by a small meteor, the monks abandoned it and left it to rot — which was just the place for an mysterious and aspiring Necromancer or Electromancer.