A vorrac is a green-aligned beast native to the plane of Mirrodin. It's a boarlike creature with huge, curving, coppery tusks, and can often be found flattening the undergrowth of the Tangle. During Mirrodin set design, the beast was called a "djeeruk."
Artificers on Mirrodin were responsible for the Clockwork Vorrac, a magically animated metal version of the boar-beast. The Viridian elves of the Tangle hunted this unnatural abomination.
Vorrac Battlehorns shows the tusks of a vorrac forged into a hand-held weapon, magically infused with the beast's unstoppable ferocity.
Speaking of ferocity, note that the Fifth Dawn "Giant Growth" effect Ferocious Charge depicts a vorrac on the rampage. (Happy Scry Week!)