-( Story related, cannot be missed )-
The big ol' boss of the Tsuta Ruins, who has taken Kokari's little dog into her web (figuratively, since he is actually in her abdomen). The fight itself is rather simple, and you might even pick up on how to do it yourself when you encounter her. Her abdomen has five barbed hooks sticking out of it, with tons of blossoms littering the outer part of the arena. To damage the boss, you must constrict three of these barbs with the Vine (Tsutagami) technique that you acquired earlier in the dungeon. Once she is down, her abdomen will open and expose her weakness. Go up to it, wail on it to take her health down, and make sure you jump away before she closes her abdomen around you (and damaging you in the process). Repeat the process until she falls to Amaterasu's might.