Blood Boar (5e Creature)
From D&D Wiki
Large beast, unaligned
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 (2d6) slashing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.
Tusks. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage and 7 (2d6) acid damage.
Blood boars are savage boars of incredible size and strength, named for their ruddy brown or deep red coats, similar in hue to dried blood. A blood boar's tusks are coated in a thick, black acid that burns flesh and other natural materials but leaves metal, stone, and similar materials untouched.