She knew the tower had once been occupied by a powerful spren named the Sibling. A spren on the level of the Nightwatcher or the Stormfather—and capable of making a Bondsmith. She had to assume the spren, or perhaps something about its relationship with a human, had allowed the tower to function. Unfortunately, the Sibling had died during the Recreance. She wasn’t certain what level of “dead” that meant. Was the Sibling dead like the souls of Shardblades that still walked around? Some spren she interviewed said the Sibling was “slumbering,” but they treated that as final.
