You had obtained Vaermina's Skull of Corruption... but there were better staffs out there in your eyes. But it made a great decoration on the basement weapon rack. So it sat there as Alduin died, as you slayed the emperor, as you became the archmage, and as you saved Solstheim. Eventually, your spouse and housecarl started to complain whenever you got back home. They were having nightmares. As were the kids and even the carriage driver. Finally, you go down to the skull and the Dreamstride kept neatly on the shelf beside it. It's got a layer of dust. Finally, Vaermina speaks to you.

Vaermina: "I give you the great power of my staff and this is how you respect it? Were it not for my barriers, I'd have taken it back to Quagmire by now." She doesn't sound mad, just disappointed. If Daedra were more emotional, she'd be huffing about this.