Insignia of Claws

From Hoard of the Dragon Queen, page 94.

Description
Wondrous item, uncommon.

The jewels in the insignia of the Cult of the Dragon flare with purple light when you enter combat, empowering your natural fists or natural weapons.

While wearing the insignia you gain a +1 bonus to the attack rolls and the damage rolls you make with unarmed strikes and natural weapons. Such attacks are considered to be magical.