I am somebody who loves epic video game bosses and over the years I think we've seen some interesting and creative ones out there. I figured in spirit of this being geek culture and us being video game geeks, might be interesting to share some of those big boss experiences. I am going to pick 3 bosses.
It's no secret I'm a huge Final Fantasy nerd, so my first two choices are from Final Fantasy XIV.
One is a fellow called "Brute Justice". Let me explain, there is a raid in FFXIV called Alexander, which is a giant living fortress and in the second raid of it there's a boss at the end. The fight seems normal to begin with, it's a boss fight. Then he has friends, you beat him and all his friends and then it's just time for their ultimate and final phase change...then this happens:
The music changes into something out of an 80's anime and the boss and his friends turn into Voltron, complete with lasers and rocket punches.
My second choice is Titan Extreme Mode. Final Fantasy games are notorious for introducing super difficult bosses. Their 2 MMO's are no different, although nowadays, especially after the expansion, Titan Extreme is not quite like he used to be. He was a nightmare to beat and it was a fight where it required everybody to work well in sync with each other and that doesn't always happen. Mistakes cost you your life and can even mean you get knocked off entirely, so you can get revived. In this run I did below, this is precisely what happened to one of our tanks, as a fight that requires a tank swap (to stop them each massive damage) it looked like the end, but me and the other healer pulled through and we won.
Things to note
If people get hit by the line AoE he does, they get knocked off, if people get stuck in a rock for too long, they die, if they stand in 1 one of the ground AoE's they lose a lot of health, and as he stacks them on top of each other, you can get hit by mulltiple ones and die, he does a move that takes of most of the tank's health, the more he does this the less the tank can resist it (hence the need to swap tanks). He will constantly place bombs to make you move and you need to move to the right place to avoid getting hit, so require timing as well as positioning. And there comes a point later in the fight where he covers the whole area in bombs, so you can avoid getting hit and the movement they go off, he smashes the ground, meaning you can't heal through it and everybody dies. Unless you all target one bomb, kill it, but he will place attacks to try and stop you. Most of the time people don't even remember which one the group should hit. Which made him to be a nasty boss and it took me quite a few attempt to get a group who can beat it.
Spoilers ahead. I thought I'd pick one from Undertale, I've only done the pacifist run, there's quite a few really good boss fights to choose from, but I decided I'd go for Flowey, because his fight is so different to the others in the game and is just madness and Flowey does some level of 4th wall breaking, every time you load the game you can only enter this fight (iirc you can't even start a new game or delete your save) and the boss will save and reload throughout the fight to disorientate you.