After consuming a wyvern you gain the following attributes:

• Increase your Strength or Constitution score by 1, to a maximum of 20.
• You gain a bite attack that deals 1d4 piercing damage. the target must make a  Con saving throw, taking 2d4 poison damage on a fail, or half as much on a success.
• When you bite a creature with a bite attack on your turn, you can use a bonus action to attempt to grapple the target.