Charge. If the spiderpig moves at least 20 ft. 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. Ethereal Jaunt. As a bonus action, the spiderpigcan magically shift from the Material Plane to the Ethereal Plane, or vice versa. Spider Climb. The spiderpig can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check. Relentless (Recharges after a Short or Long Rest). If the spiderpig takes 7 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead. Web WalkerThe spider ignores movement restrictions caused by webbing.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: (1d10 + 2) 1d10+2 piercing damage plus (4d8) 4d8 poison damage. The target must make a DC 11 Constitution saving throw. On a failed save the target takes the poison damage, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way. Tusk.Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: (1d6 + 1) 1d6+1 slashing damage.
Another experiment of the Transmutation expert Lorwyn Gorwick. A mixture of Phase Spider and Boar.
Caves.