Freyja's God Power will completely destroy an entire forest. Use this ability to deny an enemy access to Wood, to remove a barrier that protects an enemy city, or to damage Villagers and buildings near the forest.

To spark the fires, left click on the Forest Fire icon, then left click on the forest you want to burn down.  You must have <link="topic:line of sight">line of sight</link> to the trees you wish to burn.