1. Retinus the Seeker - Vale.It's in Uldum.2. Vil'thik Hatchling - Uldum.It's in the Vale of Eternal blossoms.3. There is Yiphrim le Ravageur de volonté in Uldum. He drops Déguisement k’thir bon marché.
A word of warning, don't be like me and think you can breeze through De sang, de poussière et d’os by rounding up large packs and aoe'ing them down. A lot of the mobs involved drops a nasty, stacking debuff ( Imprégnation d’anima )on you that reduces your hp by 5% per stack, and it stacks faster than you think. I saw a tank starting out with ~600k hp get reduced to about 30k hp, at which point the other stacking DoT the mobs put up ( Anima explosif ), quickly becomes lethal.