Yes i remember that but i still wasn't sure. What made me confused was the fact that they found a sword in that thaig, so it would make more sense if that was what Meredith carries. Probably found by someone, or secretly taken by one of the brothers you save down there. The point for this is that the idol itself was rather small in size to make such a huge sword. And it doesnt look like the sword has the idol in it, or something, it rather looks like its whole made from that red lyrium, except for handle which has skull on it i think... Hard to tell
I guess that would also point to the idol a bit, but those two items just could share design as they were made in same thaig too...
Hmmm.....
Well what makes me most annoyed is that i can't loot it off her after the battle.