Belt of Dwarvenkind is a rare wondrous items in D&D 5e. It requires attunement.
Wondrous Items, rare (requires attunement)
While wearing this belt, you gain the following benefits:
Your Constitution score increases by 2, to a maximum of 20.
You have advantage on Charisma (Persuasion) checks made to interact with Dwarves.
In addition, while attuned to the belt, you have a 50 percent chance each day at dawn of growing a full beard if you're capable of growing one, or a visibly thicker beard if you already have one.
If you aren't a dwarf, you gain the following additional benefits while wearing the belt:
You have advantage on Saving Throws against poison, and you have Resistance against poison damage.
You can speak, read, and write Dwarvish.