DOOM: 17 Easter Eggs, Secrets & References You Must Find

4. Soul Cube - DOOM 3

One of the most powerful weapons in all of DOOM's scattershot lore, yet resigned to the dire third instalment, the Soul Cube gets something of a reprise once you get inside a certain antagonist's office.

Sadly it can't be picked up or used, but stands as a reminder that iD are still hopeful you won't remember DOOM 3 quite so negatively going forward.