Synch Nexus
A Sync Nexus was a state during which the memories of Ezio Auditore , Altair Ibn-La'Ahad and Desmond Miles all converged. Desmond was told how to find a sync nexus by Subject 16 inside the Animus Black Room . This was necessary to prevent Desmond's mind from shattering completely, as well as to wake him up from his coma. Desmond achieved this state in 2012 by reliving all the remaining available memories of Ezio and Altair that he hadn't been through yet. Jupiter , one of Those Who Came Before spoke to Desmond inside the Nexus, revealing all that humanity and the First Civilization has faced up to that point, and may face in the future. After that, the Animus had scheduled both Desmond and Subject 16 for deletion, with 16 jumping in front of Desmond and saving his life from the deletion, ending his own in the process. Once the Black Room and the Animus itself was purged of all data, Desmond escaped and woke up from his coma, telling the modern-day Assassins "I know what we need to do."