20. The Loom chamber
Kratos now arrives back in the chamber via the mirror as it starts to crumble. There is still one last thing to do! Run to the bottom of the chamber and pull on Kratos' thread once again (to the right of the switch). Run back and slow time once again just like before. Jump back into the mirror at the top before the timer stops and the final cutscenes of the game will take place.
Watch the wonderful ending then go out and start saving for the next God of War. You know you want to after that!