I only got q8 purple staves from chests (3). From dryders a q8 purple bow, but no inscription slot (this is often the case on Eternal Shield q8 blue too).
But, i've rarely seen monsters as selfish in terms of drop as these Dryders, the ones in the Gain of Pain mission. The others in Domain of Fear are too scattered and accompanied by annoying enemies for quick farming. Except in the early days, about 5-6 years ago, i've had this kind of drop. Since then, the skins associated with the Drdyer, when i kill the Dryder in the Gate of Pain mission, are almost nil... or else imperfect, q8 8-15 / 14-26, etc. So we need to know which Eternal Shield Q8 we're talking about: perfect or not? In both cases, it doesn't seem impossible, but the locations and monsters are so weak and the situation so extreme that we're not likely to see it any time soon.
Otherwise, to return to the original subject, the q9 purple are worthless. I sell them to the merch direct.