Mass Effect isn't exactly a series full of happy endings, but the finale of the Tuchanka arc in Mass Effect 3 is especially brutal. In the mission's final moments, Shepard can carry out the sabotage and doom the krogan, or allow them to be cured of the genophage. In the latter instance, Mordin Solus, if still alive, will be sacrificed for the greater good to redeem himself after coming to the conclusion that the genophage was a mistake. In the former, the entire krogan race is likely doomed to extinction, but it is possible to save Mordin, if certain conditions are met. I know what you're thinking. The life of one person isn't worth sacrificing an entire species, right? Well, that might be true, if that person wasn't one of the most badass side characters in video game history. Mordin is so cool, players are willing to commit genocide just for the chance to save him. Of course, genocide is really bad and stuff, so that makes it an almost even trade. How far are you willing to go to save your favourite character? Will you allow Mordin to heroically sacrifice himself, or betray the krogan people to keep him alive? Either way, it's not a decision to be made lightly. If you can't convince Mordin however, you should definitely not shoot him. Doing so means having to watch one of the most brutal and gut-wrenching scenes in any video game ever, designed to make you feel as horrible as possible. You bastard.