On the edge between one abyss and another, Anko sat and caught her breath.
She'd climbed for hours and hours, it felt like. Until even her mana-enhanced body had started to strain. And just when she'd wondered if she should have explored down instead of up, she saw it: a little slice of light that marked a place where the tower had broken.
Upon reaching it, she'd discovered the "slice" looked to be about ten measures high, a break in the tree where the tower was also broken between two parts that had been bolted to the interior.
The break in the tree was wide enough to let her rest, and it was enough for her to see that she'd entered an area that was very low on mana. An area where, above her, something was filtering down a weak amount of light and spreading a strange, mucky haze that smelled rotten.