Is it possible that Xykon's Phylactery cannot be found by anyone but Xykon now? Like Ravenwing, maybe no one but someone spiritually or telepathically linked with the object can see it anymore. Or whatever relationship V had with Ravenwing.
This would mean those hobgoblins searching couldn't find it which would probably lead to Xykon spending time to find it?
If that's true, then Xykon is going to be really, really, really ticked.
I Am A: Chaotic Good Human Sorcerer (3rd Level)