War Boar

Charge. If the boar moves at least 20 feet straight toward a target and then hits it with a tusk attack on the same turn, the target takes an extra 7 (3d6) slashing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.

Relentless (Recharges after a Short or Long Rest). If the boar takes 20 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead.

Enrage. If a foreign body climbs onto the Giant Bull it will thrash around violently attempting to buck any one currently on it off. It will spend its Movement moving 5ft in a random direction and use its action to make the creatures on its back make a acrobatics check or be bucked off and take [roll]2d6[/roll] bludgeoning damage. If they are bucked off they fall prone

Goblin born. The Goblin Giant Boar's attacks will not damage Goblinoids and they cannot be charmed to attack Goblinoids

The Horns Call. Goblins trained these boar to respond to a very specific horn call when heard the boar will attempt to get out of any situation they are currently in and rush towards the origin of the horn

Tusk. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (3d6 + 3) slashing damage.

Hoofed. The Goblin Giant Boar jumps up and smooshes the target with Hoofs the target must make a Dc 16 Dexterity saving throw or take [roll]4d6+4[/roll] Bludgeoning damage and fall prone

Multiattack.  The Goblin Giant Boar makes two attacks. one with its tusk and one with its hoofs