The Void Tower is the core of Lassudral, so no matter how much the outside world collapses, the Void Tower will definitely stand firm until the end.
By then, if the Night Innkeeper successfully ascends the throne, the seal will naturally be lifted. Even if not, it is said there are channels within the Void Tower that lead to other realms, and with the force of breaking through the void during teleportation, combined with his own strength, Fafnir felt he should be able to break the seal.
This was the reason Fafnir chose to go to the Void Tower.
Besides, Fafnir was actually quite curious, what exactly had happened inside the Void Tower?
"Pack up, we're getting ready to leave."
Speaking of packing, Angel didn't actually have much else to pack. It was merely a matter of finalizing the recording in the Crystal Ball and then repacking the leftover Magic Marrow Meat into his bracelet to slowly regenerate.