Hermenegild's Dagger

A dagger made of an experimental gnome alloy, Hermenegild and his parents inscribed an extremely complex magical formation onto it. While an error in design meant that Hermenegild was the only one capable of using it properly, it is still an extremely powerful item.

The dagger, assuming the wielder is capable of activating the formation, will siphon some of the strength of its victims to its wielder, leaving them permanently stronger. To be exact, it does this by tearing off a piece of the victim's soul and infusing it into the wielder's soul.