Bunny Tiamat

Legendary Resistance (1/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Goddess: If Tiamat drops to 0 hit points, she reforms in the Abyss instantly with full health. 

Multiattack (Gain 1 per long rest max of 3) The dragon can use its Frightful Presence. It then makes 3 attacks with a disadvantage: 2 with its bite and 1 with its claws.

Bite. Melee Weapon Attack: +5 to hit reach 5 ft., one target. Hit:  (1d6 + 5) piercing damage. The defender must succeed dc 7 Con save or take (3d6) (choose: fire, lightning, acid, poison or cold) damage.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. (2d6 + 5) slashing damage.

Tail. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. (1d6 + 5) bludgeoning damage and knocked pronely.

Frightful Presence. Each creature of the dragon's choice that is within 30 feet of the dragon and aware of it must succeed on a DC 14 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Breath Weapon (Recharge 3/Short Rest). The dragon exhales energy in a 30-foot cone. Each creature in that area must make a DC 11 strength saving throw, taking (2d12) (choose: fire, lightning, acid, poison or cold) damage on a failed save. On successful save bunny takes half.

Tail. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. (1d6 + 5) bludgeoning damage and knocked pronely.

The dragon can take 1 legendary action, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 1 Action). The dragon beats its wings. Each creature within 5 feet of the dragon must succeed on a DC 15 Dexterity saving throw or take (2d6 + 1) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.