The Promise is the twentieth and final chapter of Resistance 3.
Joseph Capelli reaches the power core room. After a catastrophic fire-fight against the Chimera, Capelli destroys the power core. With the Terraformer destabilizing, Capelli barely escapes with Charlie Tent and Ellis Turner. The Terraformer collides into the New York tower, destroying it and permanently closing the wormhole.
Capelli is brought to Baxter Springs, where he is reunited with Susan and Jack. Following the destruction of the New York Tower, numerous resistance groups report from all over Earth, the resistance believe that the attack on the Terraformer in New York proved to be the turning point as temperatures change rapidly on the Eastern Coast of the United States. In an undetermined amount of time, humanity finally defeats the Chimera and slowly begins to rebuild.