Found this chilling on a hero, best I can tell it is prenerf as Q7s no longer drop with max armor. Unfortunately single mod 
Celestial Shield
Armor: 16, Q7 Tactics
Received Physical Damage -5 (20%)
PC on Prenerf (?) Celestial Shield Q7 Tac/16 -5(20%)
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Still surely low to mid xxa. 30-50a range imo
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- Official Post
The mod on it is at least maxed, so I'd probably agree with Sasha.
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Agree
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Agreed with the PCs above. And it is definitely pre-nerf, as shields in general currently drop q8 at the lowest with 16 armor.