If you're intrigued or confused by some of the compound nouns like spear-ash and axe-grove, these are poetic devices called kennings. Kennings are used partly to fit subjects into the constraints of the meter and partly to be amazing in their own right. For most of the ones used here it suffices to know that tree = man, so for example spear-ash = spear-man (Tauren?) = warrior. The kennings are the best part, like the chocolate chips in your ice cream.
Like most such poems, it's a lot better if you already know the story.