Shepard's injuries proved too much, and while desperately crawling towards a control panel, Shepard collapses. When Shepard is tasked with powering up the Crucible, an ancient weapon with the power to destroy the Reapers, he fails.
The Normandy never shows up to pick up your squad during the final assault-they all die. Me3deager's other ending, The Cycle Continues, is incredibly dark. It works best when combined with another mod that transforms the game's popular (and fan servicey) Citadel downloadable content, where players can interact with their squad and characters from previous games, into an epilogue. In this version, it doesn't result in the death of all synthetic life-only the Reapers die. You aren't presented with any options, either the only thing Shepard can do is destroy the Reapers. One of them, We Will Prevail, picks up on the changes made by the other mod, removing any and all references to the child-like catalyst.