Beelzebub

Evasion.  If Beelzebub is subjected to an effect that allows him to make a Dexterity saving throw to take only half damage, Beelzebub instead takes no damage, if he succeeds on his saving throw, and only half damage if he fails.

Fleet Wings.  Beelzebub can take the Dash action as a bonus action on each of his turns.

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

Magic Weapons.  Beelzebub's weapon attacks are magical.

Multiattacks.  Beelzebub makes two talon attacks and a sting attack.  He can replace one talon attack with a Gluttonous Mandibles attack.

Talons.  Melee Weapon Attack:+14 to hit, reach 0 ft, one target whose space Beelzebub occupies.  Hit: 17 (3d4 +7) piercing damage.

• Sting.  Melee Weapon Attack: +14 to hit, reach 0 feet, one target whose space Beelzebub occupies, Hit: 20 (2d12+ 7) piercing damage plus 6 (1d12) necrotic damage, and Beelzebub chooses one of the following additional affects:
• The target must make a DC 18 Constitution saving throw, taking an additional 26 (4d12) necrotic damage on a failure, or half as much on a success.
• The target must succeed on a DC 18 Wisdom saving throw or be poisoned until the end of its next turn.  While it is poisoned this way, it is also blinded and deafened.
• The target must succeed on a DC 18 Charisma saving throw or become charmed by Beelzebub until the end of its next turn on a failure.  Additionally, Beelzebub can force it to immediately make a melee attack against a creature within reach.

Guttonous Mandibles.  Melee Weapon Attack: +14 to hit, reach 0 feat , one target whose space Beelzebub, occupies.  Hit: 12 (2d4 + 7) slashing damage and if the target is a creature, Beelzebub regenerates that hit points equal to the damage suffered.

Enter the description for how bonus actions work for your monster here.

Beelzebub can take 3 legendary actions, choosing from the options below.  only one legendary action can be used at a time and only at the end of another creature's turn.  Beelzebub regains spent legendary actions at the start of his turn.

• Fly.  Beelzebub moves up to his fly speed.
• Talons.  Beelzebub makes a talons attack.
• Lord of the flies (Costs 2 Actions).  Beelzebub chooses any number of creatures he can see within 60 ft of himself that he has dealt damage to with his sting attack during the last 1 minute.  From each of those creatures a swarm of wasps bursts.   

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Mythic Action Name (Costs # Actions). Enter the description for your mythic action.