Natural Weapons Expert Feat

You master the use of your natural weapons, granting you the following benefits:

Prerequisite: Have one or more natural weapons

• Ferocity. As a bonus action, you can make a single weapon attack with your natural weapon.
• Natural Perfection. Your natural weapon damage die increases to 1d6. If it is already 1d6 or greater, it increases by d2 (or one step higher), up to a maximum of 1d12.

Source: KCLL, page 188