The Shadow Eminence is a new sword style that can be unlocked in the multiverse sea.
Location: The raid required to get the Eminence and trainer are at Eminence Kingdom.
How to unlock: You must collect 3 Sword Fragments from the dungeon, which are rare drops. Then talk to the NPC at the island to learn the sword style. WARNING: THE BOSS HAS 500B HP, which is a lot for even new max stats, so doing this dungeon with a friend is recommended.
For the Mode: You must go back in the dungeon, and obtain a Slime Drop, if you do not have one already. Once you give this to the trainer, you can use the U move.
This sword is the 2nd highest damaging sword in the game, with it doing a total of 96B damage [Which is nearly 2x Dragon Slayer (the 3rd best)]. The Shadow Eminence is only out done by True Yoru (I also made a new page for that sword) by about 10B damage. So I would recommend trying to have someone carry and get yourself The Shadow Eminence if you aren't in third sea yet; it will be a huge help.