In
Nethack, Stormbringer is a handy
weapon for the
chaotic. (If you are not chaotic, its
power will blast you every time you pick it up; this makes it less handy). Apart from being a resonably powerful
artifact, its attack often
drains hp from its
victims, transferring them to its bearer. This is
nice.
What is less nice is that it will often attack of its own will. Well, not quite. But here's what happens: Motion into a monster is considered an attack. So normally, before attacking a peaceful monster, the game asks you if you're sure. Wielding Stormbringer, you throw such caution to the winds. This can be very dangerous, even for a chaotic character.