It was a good idea while they were roaming about, but not now that they have had a base for a few months. We know Xykon spent most days crafting magic object (from the complaint that he can only do 8 hours of such work a day, even though he is awake all 24), and we know he prides himself in protecting himself from damage types. While strictly speaking he has probably lost the original ring, it is extremely likely he has crafted a second one by now, to substitute it.
I think that was a reference to the fact that the lowest you can roll in 3 dice is a 3.
Grey Wolf