Dungeons behind the atlas entrances

The atlas places about 170 dungeons of 11 kinds and the world dressing builds their entrances, but they lead nowhere. Not needed for the first alpha (the loop is above ground); the next big piece of PvE after it.

• Generated dungeon levels per kind (mines, crypts, caves, the ruined imperial capital) as separate maps or underground layers, joined to their entrance.
• Monsters by danger (creatures-and-spawns), rare resources and crafting inputs as rewards, no coin.
• Lighting underground (only artificial light, as the night look).

Done when the great March dungeon can be entered, fought through and left with loot.