It does spirit damage... I needed that in the swamp, not the mistlands. I got a draugr fang bow in the swamp that does poison damage for an area that is resistant to it. I got frost weapons in the mountains against things that aren't really resistant to frost?... sure why not.

The progression and unlock of these weapons is 'logical' but not useful. Now I can use the most powerful bow in the world in the swamp and 1 shot everything, ok, but why is it end game for a bow that's only truly useful in a low level area?
Why can't I just upgrade all the weapons to max equal stats? need a balance pass for sure.
Don't get me wrong, right now everything either goes to 95 total damage or 105 but many of them are spread out so much in different damage types that aren't really useful when you unlock them.

I have all the weapons and I still use the draugr fang because the swamp is a low level area and using the most powerful bow in the game there just seems a waste when everything in the swamp takes enormous amounts of blunt damage. I don't need a spirit damage bow. I would rather have a frost bow or a fire bow, hell, a blunt bow would be better than a spirit bow at this point. But I know for sure that I'll really want a fire bow when the Deep North comes out and everything is resistant to frost. The Ashlands is surely going to be fire resistant so I guess poison is the way to go in the end.