Adventurers can now obtain the Electrified Bone Bladed Claymore after they've finished the original quest. By right-clicking on the forge in Runnyeye with both the standard BBC and Berik, Sword of Thunder in your inventory (but not equipped), you can "Break Berik over the forge." Berik and the BBC will be removed from your inventory and you will receive the Electrified Bone Bladed Claymore. Note: If you choose to do this, you cannot change the EBBC back to the other two swords, so please be sure of your decision.
Can this item be upgraded to "Electrified" after you finish the quest? Say you complete the BBC then the SoT, can you strike BBC with Berrik after you have BBC?