"What is it?" Jake asked as he scrutinized the object from every angle. He had a vague idea, but he wasn't entirely sure.
"A key and much more." Sigmar smiled mysteriously. "Even if it was a present to my son, a Fluid Artifact of this caliber is never given without taking a few precautions. After all, mishaps can always happen, or it could be stolen. Being able to locate it and regain control at any time has always been my privilege. My son doesn't know it, or maybe he does, but he has modified this Fluid Artifact so much that he probably thinks it's impossible.
"I can no longer use this key to control his Fluid Artifact remotely, but that doesn't mean it's not feasible with direct access. To give you a more graphic example, anyone who thinks they know their computer better than the manufacturer is naive. Even if I can't access its "contents", restoring the factory default settings is still pretty simple.
