By far the most vital of all the floors, the U-Vamp is what truly makes this establishment complete. Without it, this establishment would be uninhabitable in the long-term, especially for a coven. Due to being one of the six floors that are strictly dedicated to coven members, it is completely off-limits to any and all who are not members of the coven. To ensure this, the original builders of BFC Stronghold built powerful ancient enchantments into the stairs themselves, both the main stairs and the library stairs. These enchantments make finding, more or less accessing, them next to impossible if you do not have the knowledge and tools necessary to counter the enchantments.
U-Vamp is short for Underground-Vampire Facility, and all covens must have one, as it is absolutely vital when a vampire experiences their first death, going from living to undead. This is one of the biggest factors that makes a stronghold so perfect for a coven, as all strongholds are built with a fully functional hospital on the lowest floor, with the library as their primary source of medical information and documentation. Just like every floor of the library, this floor has rows and rows of bookshelves, a staircase to the upper floors curled along the wall adjacent to the door, and a quite sitting area. This floor also holds a massive kitchen, a dining hall, a sitting room, and a garden room. The garden room houses a living zen garden that is also their primary source of herbs.