- Go down RA's temple and go towards Odin, here you will find a gate in between the trap and Odin.
- Walk up to the corner of the gate and down yourself, have your friend use Nowhere but here and he will teleport inside the gate.
- Have him down himself and then you use Nowhere but here and you both will be inside the gate.
- Now from there jump onto the ledge in the corner and have your friend get on the top of the glitch.
- Done the zombies will start piling-up.