Keen Senses. The wyvern has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell.

Magic Resistance. The wyvern has advantage on saving throws against spells and other magical effects.

Draconic Connection. The wyvern can magically communicate with its partner as long as they are within 1 mile of each other. 

Draconic Life Force. The wyvern cannot die. If its hit points should be reduced to 0, it instead enters a dormant state. While in this state, it is considered incapacitated, though it can still walk. After finishing a long rest, the wyvern awakens with full hit points. 

Bite. Melee Weapon Attack: +[(proficiency bonus) + (Dexterity modifier)] to hit, reach 5 ft., one target. Hit: [2d8 + (Dexterity modifier)] piercing damage.

Scratch. Melee Weapon Attack: +[(proficiency bonus) + (Dexterity modifier)] to hit, reach 5 ft., one target. Hit: [2d8 + (Dexterity modifier)] slashing damage.

Pinion Gale. The wyvern harshly flaps its wings, causing strong winds. Any creature in a 30 foot cone must succeed on a DC[8 + (Dexterity modifier) + (proficiency bonus)] Dexterity check or be blown away from the wyvern 15 feet.