Sephiroth, the new character in the Super Smash Bros. Ultimate roster, is available now for anyone who has purchased the Fighters Pass Volume 2. However, unlike previous DLC fighters, you need to defeat Sephiroth to unlock him, otherwise he remains locked for another week. The fight is live now, and thankfully, unlocking him is very easy.
When you start the game up, if you have the Fighters Pass, the Sephiroth Challenge will appear on the main menu, and you can start it by pressing the + button.
The Sephiroth Challenge is a HP battle on his new stage, Northern Cave, and there's three difficulty settings you can fight the Final Fantasy villain at. Doing so is not much of a challenge, especially on Easy, meaning that Sephiroth is effectively available today for players of almost all skill levels.
On Easy, Sephiroth will have 100HP, on Normal, he'll have 150HP, and on Very Hard he'll have 200HP. The description for "Easy" difficulty reads "For players who want a near-certain victory," which is more or less accurate, as your attacks do more damage at this difficulty, too. On Normal, I was able to defeat Sephiroth with ease as Cloud, taking just 4% damage. Very Hard is much more of a challenge, although Smash Bros. pros are unlikely to break too much of a sweat.
Defeat Sephiroth on any difficulty and the character, as well as the Northern Cave stage and all of its associated music tracks, will be unlocked immediately.
There are also new Final Fantasy Mii Fighter costumes releasing, but you'll need to wait until Sephiroth's official launch on December 22 to get these.