6. Human-Reaper (Mass Effect 2)
https://www.youtube.com/watch?v=fsDqMbO9S9g It's quite common for fans to argue about which entry in a series is the best, especially if it's as popular as Mass Effect. And while most fans tend to agree that Mass Effect 2 is the highlight of the original trilogy, it's hard not to come away from the battle against the Human-Reaper from ME2 saying it's the best boss fight the franchise ever produced. Its massive scale and huge stakes come together perfectly in the final suicide run mission of the game, leaving every player who experiences it completely breathless. Everything just works, from the stunning reveal to the cinematic scope at which the fight progresses, it all comes together to make you feel so very small in comparison to the titan in front of you. Each segment of the battle steps up from the last one, where the game throws a perfect balance of enemies at you until the conclusion has reached its absolute peak. The battle against the Human-Reaper is fantastic fun and a great challenge to any Mass Effect player, the ultimate final test for your Shepard.