For THF, better than Orichalcumshells are
Slough Skua in Caedarva Mire. They are a short walk from Nashmau, and unlike the rest of the level 85+ mobs that were added in the last update, Hide works on them. Wiki has them listed as sound at the moment, but that can't be right, as I know for a fact Hide works on them; I've watched a THF friend in my LS do it more than once. The one thing to be careful of when using them is that they link, but from what I saw, it shouldn't be too hard to pull without links; they tend to stay spaced out enough.
The downside, of course, is that like all the 85+ mobs they added in the update, they are in a ToAU area, which means Sanction. :/ Losing out on the increased HP recovered while resting is annoying. But if you actually fight them rather than just letting them hit you til you're low on health and using Hide (/DNC is great for this), then that's not as much of a problem unless something goes pretty wrong and you have to Hide to save your life, lol.