The Knife of Evil

History
The Knife of EvilTM exists within the Terrorvortex and is a very powerful evil artifact.

Powers
The Knife of Evil infuses all stabbed by it with Anti-Telharsic power causing them to go mad and turn into evil warriors of darkness.

Once Anti-Telharsic power flows through your veins you have a very short window of time before you turn, in which you may choose to do like Angus McFife XIII and end your own life.

If you choose to not do so, you are corrupted and turned to the forces of darkness. Zargothrax controlled those he had stabbed with this dagger, so it is likely that the user can control those he corrupts.