Shinryu (Final Fantasy)

Shinryu is an optional boss in Dawn of Souls and 20th Anniversary editions of Final Fantasy. He is arguably the hardest boss in the former. Shinryu is very adept at wiping out entire parties with ease, as he wields various attacks that all inflict large amounts of damage to all party members.

Although Shinryu can use Thunderbolt, Ice Storm, and Tidal Wave, the biggest threat is his ability to cast Flare. With each casting, Flare can either leave the party close to death, KO a few and leave the rest on the verge of defeat, or destroy them outright. Shinryu's physical attack can inflict large amounts of damage as well.

The speed at which Shinryu can cleave through a party makes this battle more about all-out power than anything else (instead of the endurance battle Omega ends up being). One should be at least level 70 to avoid being utterly annihilated in a couple of turns, but successive castings of Flare will still doom anyone. Victory is likely if Shinryu doesn't wipe the party out in the first few turns, because his 35,000 HP isn't well-protected and he is susceptible to high-powered physical onslaughts.