Bull

Charge . If the bull moves at least 20 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 4 (1d8) piercing damage. If the target is a creature, it must succeed on a DC 11 Strength saving throw or be knocked prone.

Relentless (Recharges after a Short or Long Rest). If the bull takes 7 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead

Gore. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d8 + 1) bludgeoning damage.

Scream.  The bull lets out a threatening cry. Any creature within 20 feet of the bull must make a DC13 wisdom saving throw or be paralyzed until their next turn.