He was last seen trying to Crest the mount of Alpha Lupi, walking Third in line with a Man in a Mask. It is said they were in Dire need of a Skull, possibly belonging to a long dead Ahamkara.
Edit: top three. How hard is xur...to find now?
Bored? Check out my most recent video:
https://www.youtube.com/watch?v=ccOkjEHx6lo
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At this point you should just make it a weekly Xur review. Just saying