A famous aumaua apothecary, Tama has had the misfortune of getting captured while on one of his research outings. As it turns out, Bipara and her witches really do not take kindly to people trying to steal their alchemical secrets. Once freed, he becomes a high end alchemy vendor.
If you had Zahua as a companion in Pillars of Eternity, Tama Watua will mention him if asked about the cauldron (though both Serafen and Pallegina must be present)