Arcanite Ripper

The Arcanite Ripper is an epic two-handed axe with a very special on-use effect.

Source
The Arcanite Ripper currently has a small chance to be found on the Black Market Auction House, posted by Bergrisst for the opening bid of, and additionally inside the Unclaimed Black Market Container as well.

The item originally dropped from Tenris Mirkblood in Karazhan during the Zombie Infestation pre-WotLK event. It was removed from Tenris's loot table 2 weeks after the start, after which it was unavailable until the introduction of the Black Market Auction House with patch 5.0.4.

Notes and trivia

 * Upon equipping this weapon, it can be right-clicked to trigger the Arcanite Ripper effect, transforming the bearer into Bergrisst. This effect lasts 12 seconds and has a 1-minute cooldown.
 * The item is, quite obviously, a reference to the Arcanite Reaper.