Ancient Sands

**Description** The new tomb dungeon can be encountered in the desert biomes. It generates with random rooms set, some of which will present the chamber block. There are rare and common chambers requiring its own type of key, by a small chance dropped from the new mobs. Once opened, it gives a random configurable loot item. If there is no key around, a chamber can be taken into inventory and opened later. A supplementary metal is added, used for repairing the weapons acquired via looting. Remnant blocks are immune to common exposions. Ancient Sword has the charged slash ability: hold for a strong attack on the nearest entity.