Decay

Locations:
Price: N/A (Reward from the 'Open Treasure Chests!' quest)
Sellback: 0 AC (Cannot be sold)
Rarity: Epic Rarity
Base Damage: 21-39
Description: The origin of this sword is unknown, but legend says the smithing required a sacrificial element…

Thanks to Lord Coxy, Shal and Tendou no Mazo.