Hust swords mentioned in Malazan.
"... were made in the forges of the Hust Hold in the realm of Kurald Galain. These swords were quenched in Dragon's blood and were forged to slay Eleint."
An Eleint is a Dragon, btw.
They also made a sound like hysterical laughter when killing. very creepy.
Other magical properties
"They were supposedly immortal, immune to all decay, and could shear other blades in two. A broken Hust sword would also heal in time. It could also sense those of Eleint blood nearby, other than its wielder. Hust blades protected their wielders from exhaustion, magic and mundane attacks, and enhanced the wielder's capabilities by 'fusing' with them. This could cause destruction of the physical body of a person wielding the Hust sword, since their actions were beyond the limits of their body.
Hust weapons were known to be possessed, laughing and shrieking with glee as they slaughtered everyone who dared face its wielder in the battlefield."