Galaxy Brain - Heroic Sacrifices edition

Sacrificing yourself to save your mentor just to turn out that he never was in danger, and the only thing that you archieved with it was sending your little bro into depression and near murder.

Sacrificing yourself to activate a shield that protects the earth from an extinction level solar flare and simultaneously releasing the spirit of a god that forced you to murder one of your allies in an earlier game only to have your body taken away so your DNA and the memories of your ancestors can be used to make fucking video games.