Ragnarök is the Norse apocalypse, the end of the world. Heimdall will signal it by blowing on his mighty Gjallarhorn when he sees the sons of Muspelheim (a fire world) ride across the Rainbow bridge of heaven into Asgard (the home of the gods). It will be a viscious battle and many of the gods will perish. The moon and sun will be swallowed and the whole of the universe will burn.
This piece is fairly chaotic... my intent. The scene is well into the battle but just before the Moon is swallowed up.
