I'm predicting He's selling GHORN or icebreaker. Possibly hard light.
I've seen GHORN n ice drop recently and seems that's the RNG!
Whenever u see them the likelyhood for xur is increased. No guaranteed though.
Also I don't care what he sells. It's almost lost its luster. We need more space and weapons.
If I pick one, its heart of praxic. Just so bitchy warlocks keep crying, and ill break the useless one sitting in my vault!