"A sword I found seems to have some level of intelligence. It claims to be Berik, a former Knight of Thunder who devoted himself to the eradication of undead. It certainly seems unhappy with its current plight." --Everquest II Journal
Important note: Upon examination of the sword a quest window will open; DO NOT ACCEPT THE QUEST UNTIL YOU ARE FINISHED WITH THE DIALOGUE. If you do accept the quest first, then delete the quest from your log and examine the Sword of Thunder again. At the end of the dialog a new item will be put in your inventory called "Berik, Sword of Thunder." Examine this Sword and accept quest. This is the sword you will need to inspect after each further step.
Berik, Sword of Thunder will tell you to kill 100 undead knights in Stormhold. Any undead count: All skeletons and zombies work (Knight, sentry, squire, defender, burnt, etc.) Once this step is done talk to the sword again.
Next it will ask you to kill 3 named bosses in Stormhold:
Defiled Lord Byron, he who gave the order to forge him. ( -45, 9, -60 ) Copy/waypoint -45, 9, -60
Blacksmith Brigg, he who forged him. ( -138, -1, -46 ) Copy/waypoint -138, -1, -46