Anvil of the Kings

The anvil of kings is a large, 100-lb. mithril anvil
measuring 3 feet long from tip to back, 1 foot wide at
its widest point, and 2 feet tall. Its sides are etched with
dwarven runes of creation and strength, which glow with an inner blue fire.

Effect
While attuned to this item, you gain the following benefits.

• You gain proficiency with black smithing tools
• The anvil generates its own heat, and can duplicate the
  effects of a full forge at the owner’s discretion.
• All items successfully crafted are light, strong and aesthetically pleasing to behold (aesthetics are to the creator’s values). Items weigh half as much as regular items of that type, and are twice as durable (the items hit points are double those listed in the Dungeon Master’s Guide).
• When crafting using the anvil, that the created item is extraordinary in some way, the anvil infusing it with magical energy. Roll 1d20. On a 20, the created item is equivalent to a common magic item, and the DM generates a minor magical property for it.

Notes: Proficiency: Smith's Tools