Seize the glowing sword at the top of the spiral stairs in Stormhold ( -150, 6, -96 ) /waypoint -150, 6, -96. An Inert Bone Bladed Claymore will appear in your inventory. Examine it to be offered the quest.
Kill Opalla, a level 42 ^^^ heroic gnoll shaman, inside Blackburrow. You can find Opalla directly south of the bridge, in the farthest room ( -24, -16, 83 ) /waypoint -24, -16, 83. He will spawn and attack you as soon as you enter the room. (Opalla has been renamed to Opolla. See Discussion)
Examine the sword.
Slay Redak, the Troll Warrior, a level 44 ^^^ heroic mob located in the chapel in Stormhold ( 72, -16, -25 ) /waypoint 72, -16, -25. Easiest way to get to the chapel is to go down the spiral staircase, go down the hall to the atrium and enter the door to the left of you, There will be a "pond" in front of you, take the path to the right and follow it down until you are in the room with the cavaliers. Go up the staircase and follow the hall that wraps around the room to a door that will be on your right.
Examine the sword again.
Re-forge the hilt and bone blade and make it one again.
In order to re-forge the blade you must have an ebon cluster
Go to Runnyeye and head down the path just past the bridge until you come across the first room with goblins past the archway, there will be another room with more goblins. Once you enter the room to the left there will be a small alcove and inside will be a forge and a anvil sitting in front of the forge. Inspect the anvil to reforge the blade. ( -10, 1, 5 ) /waypoint -10, 1, 5
Examine the sword again. To get your sword you will need to slay 1,000 Sentient beings.
This means killing any intelligent monsters. Examples: skeletons, goblins, gnolls, lizardmen, zombies, and bandits. Golems and any type of undead monster are not.
Note: You could choose to stay in Stormhold, for at least a part of this step, and simultaneously complete Berik's Revenge, which requires killing 100 undead.
Shortcut: Go to Antonica near (-1,154.62, -30.87, -1,027.39) and just kill Goblins there till You ding 1,000. Another place is at Behemoth Pond in Nektulos Forest....lots of sentient mushrooms there! Or you could always kill the Nightfall giants nearby. Chronomentor to 25 or 30.
I found the fastest place to be in Frostfang Sea at ( 653, 23, -262 ) /waypoint 653, 23, -262 as there is a continuous spawn of grey orcs. Alternatively, Chronomentor down to level 5 or 10 and go to this same spot. Get a merc up and just run around and aggro the A risen Ry'Gorr and let the merc take them down. Near instant re-spawn so it won't take long to get your 1,000 kills.
Examine the sword again.
Kill Gynok Moltar, the first wielder of the claymore. He is a level 47^^^ heroic mob, that spawns when you enter the room where you first grabed the Claymore on top of the spiral staircase in Stormhold.