Bull Dragon

Multiattack. The dragon makes two attacks: one with its bite and one with its claw.

Bite. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 21 (2d10 + 10) piercing damage plus 7 (2d6) fire damage.

Claw. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 24 (4d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 19 (2d8 + 10) bludgeoning damage.

Spit Fire (Recharge 5–6). The dragon spits a glob of flaming spittle in a 20-foot line which is 5 feet wide. Each creature in that line must make a DC 21 dexterity saving throw, On a failed save a creature is set on fire and takes 28 (8d6) fire damage, or on a successful one they take half as much damage and are not set on fire. A creature that is set on fire by this ability takes 7 (2d6) fire damage at the beginning of their turn for 1 minute or until a creature uses its action to smother the flames. 

The dragon can take 3 legendary actions, 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.

Tail Attack. The dragon makes a tail attack.

Swat (Costs 2 Actions). The dragon swats the creatures in front of it with one of its giant claws. Each creature in a 10-foot cone must succeed on a DC 22 Dexterity saving throw or take 14 (2d8 + 10) bludgeoning damage and be flung up to 30 feet in a direction perpendicular to the cone direction, takes 1d6 damage per 10 feet traveled, and is knocked prone.