Keryvian

Keryvian (also known as Foebane or Demron's Bane ) was a Baneblade of Demron, variously described as a mighty hand-and-a-half broadsword or one-handed bastard sword.

Powers
Keryvian was imbued with properties that made its blade magically keen, allowed the wielder to jump and fall gently over large distances, and allowed the wielder to set a magical proximity alarm. The sword could also reflect back magic cast at it or its wielder.

The sword could be commanded to "guard" and would wait until anyone who was not the owner touched it, at which point it began attacking that individual and making a very loud singing noise.

The value of the sword as of 1368 DR was estimated at 35,000 gold pieces.

History
It was once carried by Fflar Starbrow Melruth. As of 1368 DR it was in the ruins of Myth Drannor, but Seiveril Miritar recovered it some time after this and it resided at Seamist in northern Evermeet where it decorated a wall for a time, until Fflar was resurrected and took up the sword once more.

Keryvian was crafted by the archmage Demron before the fall of Myth Drannor, and was considered the greatest of his series of Baneblades. The blade was used by a thief to kill Demron, hence the name "Demron's Bane". Keryvian's blade glowed with a blue fire when drawn, which was bright enough to read by, and the hilt bore the likeness of a blue dragon with “teeth” clutching the blade. Only a capable warrior of good heart could take up Keryvian. Like all of the Baneblades of Demron, Keryvian was a powerful magic sword that was imbued with holy energy and that was particularly effective against outsiders, undead, and any evil-aligned creatures, "burning" the life (or unlife) out of them.

Keryvian's (Foebane's) full power was only realised when it was combined with Fflar's scabbard, which was also magical. Without it, the sword was simply somewhat-powerfully enchanted and did extra damage against all undead, shapeshifters and outsiders. Combining the two was not simply done, though, and required special means. With the scabbard, the sword's grew stronger and it cast Larloch's minor drain on its target every time it hits.