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Here are seven of the toughest optional boss fights in video game history.
7) Elizabeth – Persona 3 Reload

The Elizabeth fight doesn’t require quick reflexes or pattern recognition. Instead, you’ll need to bring a picture-perfect strategy to the table if you even want a chance of taking down this Persona superboss. See, the Elizabeth fight has several unwritten rules that are never explained, and if you break even one of them, she will one-shot your party.
You’ll also need to bring the right Persona rotation, so you can switch when she does to counter her attacks. Essentially, if you want to take down Elizabeth, you’d better bring a guide.
6) Emil – Nier: Automata

Emil might seem like a friendly shopkeeper during your time in Nier: Automata, but if you complete his many sidequests and track down all of the Lunar Tears (not an easy task on its own), you’ll unlock a secret fight against him. And don’t expect Emil to be a pushover
Instead, this fight sees Emil flooding the arena with head-shaped projectiles, making movement nearly impossible. He also shoots out lasers that will drop your health bar in a hurry, so you have to stay on top of your heals. On top of all that, he’s also fighting psychological warfare with you the entire time, constantly hitting you right in the feels with his tragic dialogue.
5) Sans – Undertale

The Sans fight happens if you take the Genocide route through Undertale. That means killing everything in the game, which will take quite a bit of time and will kill your soul a bit. Your reward for doing so is the hardest battle in the game.
Remember, Undertale‘s combat is bullet hell, and Sans does not take things easy on you. You’ll need to memorize all his patterns and operate with quick fingers to keep safe. That said, it’s not just about speed. You’ll also need to have surgeon-like precision to evade some of Sans’s more difficult attacks. The battle is so hard that fans have created a separate training simulator where players can practice Sans’s attacks outside of a run to prepare for the onslaught.












