Arthera
Another mention I read is that god-bloods can attune to artifacts, but cannot gain the magical material bonus. No mention of a roll or anything else was included in the line.
Yes, I believe it says something to that effect in Oadenol's Codex, though I can't remember the page number. I do know that pgs. 59 and 133 of Scroll of Heroes reiterate that Enlightened Mortals and God-bloods cannot gain a MM bonus, with Half-Castes (the children of powerful Exalts) being able to overcome this with the right Merit.
On Another Note:
I think there is some confusion as to where different NPC's are located.
o--Queen Sahula is imprisoned in Carnelian Peak, the capitol city.
o--Aparna is also in the capitol city, but in a far less secure location, which is why it is possible to meet with her in the first place.
o--Raemonn, the sorcerer, is in a town out in the Rokan-Jin countryside.
