Ultrakill (Video Game) - War Without Reason

Er…I don't mean to steal your thunder, but the "War without Reason" in the context of Ultrakill comes from the Final War, where humans were almost driven extinct by their own war machines due to it getting to the point where the entire conflict was completely automated and out of humanity's hands.

The Final War only ended because all the ash, smoke and chemical fumes blotted out the sun which caused all of the major war machines to run out of power and die as blood alone couldn't keep their massive frames going.

As a side note, because I think you'll find it interesting, I'll comment down below on what Hell thought of the Final War and it's machines.