Ready at Dawn worked on two God of War games, so it's not unsurprising to find a homage to the adventures of Kratos in The Order: 1886.
Yet, the developers found a rather peculiar and funny way to drop this little Easter egg in the tunnels leading to London's subway.
You can check it out below. Of course it can be considered a very mild spoiler, even if it has nothing to do with the story.