The Wightblade

Description
The scars of the war that tore the Exiled Lands apart thousands of years in the past are still apparent today. And the dead walk the ancient battlefields, carrying weapons that glimmer with ancient sorrow.

This blade, taken from one of the dead, allows the vitality of the dead to seep into the bearer. Its unearthly light reminds the wielder that death is the consequence of living, and thus encourages them to live just a little more strongly.

This weapon increases vitality.

Source
The  can be found in Legendary Chests.

Repair
This item can be repaired with a.