Ragnarok

Ragnarok is a Halo 4 multiplayer map. It is a remake of the map Valhalla from Halo 3, which itself is a spiritual successor to Blood Gulch and Coagulation. The map is also featured on some missions of Spartan Ops, in which it is known as Two Giants.

Description
Ragnarok is set in an area where some scientists believe that the Forerunners placed spire beacons within deep chasms to protect them from offworld debris and other external threats, while others believe they used the steep environment’s natural harmonics to amplify signals when firing deep into space.