Rare Adventuring Gear (Smith’s Tools), Requires Proficiency with Smith’s Tools

• When used as part of Smith’s Tools, it gives a +2 bonus on ability checks made with them. 

Essence of Quicksilver. When you finish crafting a non-magical item using the Mercurial Tongs, you can make it into a Mercurial item, giving it the following properties for 24 hours based on its item type. If an item loses its Mercurial property, it transforms into an ordinary non-magical version of their original item type. 

• Mercurial Weapon or Shield. A creature wielding this item can use their bonus action to transform it into any ordinary simple or martial weapon, or a shield.
• Mercurial Armor. A creature wearing this armor can use their bonus action to change its appearance, making it appear as any other armor, or as any set of clothes, as long as it covers the same parts of the body as the original armor. This effect is not an illusion, and the armor retains all of its capabilities and durability. 
• Mercurial Ring. If a creature is wearing this ring and touches a different ring or seal with it, they can use their bonus action to transform it into a perfect non-magical copy of that ring or seal.
• Mercurial Pole. A creature wielding this pole can use their action to change the pole’s length from anything between 10 ft. to 30 ft.

Mercurial Tongs have 3 charges. You can use your action to touch a Mercurial item with the tongs and expend a charge to make the item Mercurial indefinitely.
The charges can only be regained by touching an item made indefinite by this feature and using your action to remove its Mercurial property. 

Losing attunement makes all items lose the Mercurial property.