Boaron

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 3 (1d6) slashing 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 boar takes 7 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead.

Tusk Saber. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 8 (1d6 + 1) slashing damage.

If one of these creatures spots a living thing it will do 1 of 3 things:

stalk: it stalks the creature that the Boaron spotted for a certain amount of time and when the time is right it will strike. 

charge: the Boaron will enter a rage state and attack the creature that it spotted if the charge hits it always uses "Tusk Saber" but with +2 damage

lure: the Boaron will try to lure the creature towards it usually using food, or in rare occasions magic items! you see some Boarons see adventurers trading and showing interest in magic items, so when a Boaron sees an magic item it'll snatch it and store it in its home in the hopes that they can use it to get a bigger meal.