Boar

A boar moves through thorn and deadfall as if the ground had been cleared for it. Most flee from noise, but an injured animal or an adult defending young turns with shocking speed and drives its tusks upward. The first warning may be a wet grunt from brush only a few strides away, followed by vegetation folding beneath a body built like a moving stone.

Tusk Charge: piercing, melee 5 ft, +3 to hit, 1d10+2. If the boar moved at least 20 ft in a straight line first, the attack deals an additional 1d6 damage and the target makes a Quick save or is knocked down.

Brush Breaker: ordinary undergrowth does not slow the boar. A solid obstacle that interrupts its straight charge removes the additional damage; if the boar misses after charging, it suffers -2 AC until the start of its next turn.