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 el Devastador de Voluntades in Uldum. He drops Disfraz de k'thir económico.
A word of warning, don't be like me and think you can breeze through Sangre, polvo y hueso by rounding up large packs and aoe'ing them down. A lot of the mobs involved drops a nasty, stacking debuff ( Infusión de ánima )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 ( Ráfaga de ánima ), quickly becomes lethal.