The description of the eagle spirit says “Casting an Eagle Skill grants 4 seconds of the Storm Feathers Movement Speed bonus” but does not explain what the bonus is. Considering that the spirit hall can be unlocked at level 15 and players probably don’t have many legendaries yet at that point, this is likely to be where they first encounter the term, as it was for me. It took a while to realize that I could use the search function in the codex of power, and sure enough, there’s a few aspects which also grant storm feathers and modify it in various ways. It’s not like the spirit selection panel is short on space, so it would be great if the description of the movement speed bonus could be added there.
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curious what this is too
Lots of Spiritborn ability or special tags are not well explained 
Hard to make up your own build in those conditions!