Play Ragnarök: Fall of Odin, a Five reel, 25 payline, online slot machine by Genesis Gaming. This game is based on the Nordic mythology of Ragnarök (Fate of the Gods), it is a series of events already foretold including, battles where the legendary gods, Odin, Thor, Týr, Freyr, Heimdallr, and Loki fought and ultimately perished.
The Rune is the wild symbol, it does not substitute for the scatter symbol, it creates its own winning combination when multiple symbols appear on an enabled payline.
The Tree (Yggdrasil) is the Scatter, it can not be substituted by the wild symbol and it activates the bonus game when three appear on the reels.
If Scandinavian legends is your thing then try checking out Thunderstruck II