Black Lynel

Charge. If the Lynel moves at least 10 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 12 (3d8) piercing damage. If the target is a creature, it must succeed on a DC 16 Strength saving throw or be pushed up to 10 feet away and knocked prone. If the Lynel makes a weapon attack, it gains one extra damage die.

Territorial. The Lynel has expansive knowledge about its territory and so ignores difficult terrain.

Reckless. At the start of its turn, the Lynel can gain advantage on all melee weapon attack rolls it makes during that turn, but attack rolls against it have advantage until the start of its next turn.

Innate spellcasting. The Lynel can cast Fireball Without components as an action. The Lynel has five slots and can use a bonus action to regain 1d4 + 1 charges. It can also cast an enhanced Misty Step with a range of 60 Ft as a bonus action on its turn. This Lynel can also cast Circle of death without components as an action. It has 2 slots and can use a bonus action to add 1d4 - 1 charges - with the chance to lose a charge.

Multiattack. The Lynel makes two attacks with its sword.

Savage Lynel Sword. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 31 (4d12 + 7) slashing damage.

Gore. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 7) piercing damage.

Lynel Bow. Ranged weapon attack: + 8 to hit, reach 80/160 Ft., one target. Hit: 8 (3d4 +2) Necrotic damage x5.

Second Wind. Recharge 5-6. The Lynel pushes itself beyond natural limits, gaining an extra attack on this turn. However, One PC can use an action on their turn to mount the Lynel, gaining advantage and an extra damage die on their attack[s]. On its turn, The Lynel can use a bonus action to buck off the PC, dealing it 12 (2d8 + 4) Bludgeoning damage - The player can make a DC 18 DEX saving throw, to take half damage.

Sharpshooter. As a reaction, the Lynel can make a bow attack on one enemy target he can see that is moving - after they move at least 5 Ft.