Really now. You can upgrade all other Dragon Priest masks (at least vanilla ones, I'm not sure about the three other new ones), so why not this one? It really irritates me, because it has a really high armor level.

beth prob forgot to put an upgrade tag on it
happened for a handfull of gear (honed falmer weaps, etc)

This. Just an oversight.

They better patch the [censored] upgrade in. Or I will kill myself.

" well that escalated quickly"

Yeah, you can't upgrade anything else of his. You can upgrade his sword, though, I've done that. Can you upgrade staffs?

Hopefully they patch this.

I really hope bethesda fix it soon! It supposed be unique mask, how? You cant even improve it jesus christ!

So far they haven't patched any of the other gear affected by this oversight(Nord Hero Bow, Silver Sword, etc), so they're way past due.

Seriously, the mask of the MAIN BOSS of the DLC. Everything before were just corner cases, myabe by having such a well-known piece of gear affected, they'll get of their butts and fix it.

My thoughts exactly.

"I mean, that really got outta hand fast"

"It jumped up a notch."