William wielded the Sword of Aeons and battled the Queen of Blades for weeks on end, raising mountains and carved valleys with their battle.
With this sword in hand, you possess the power to reshape the world at a whim. However, the task becomes exhausting and grueling when undertaken with a specific purpose, focus, and precision.
The weapon is unnaturally sharp, will never dull, makes you much more durable, helps you recover from wounds that would kill an ordinary human, and regenerates your mana (if you have any) much faster. Additionally, it constantly offers you valuable insights from William's life as long as you possess it. Even when you run out of mana, or just don't have any, the sword will tap into William's mana as an alternate source to fulfill your desires.
Be careful of using it though, as the sword has a tendency to slowly corrupt its wielders.