S'drassa is a Khajiit alchemist and member of the Leyawiin Mages Guild. He gives the quest "Tears of the Savior."
He is also an Alchemy basic trainer. It is rumored that he is searching for a cure to Skooma addiction.
He will ask the Hero to find Garridan's Tears. S'drassa enjoys collecting crystals, especially those of a magical nature, and is willing to pay a handsome amount of for each Tear recovered.
Leyawiin "I am the best alchemist in Leyawiin. But if you need Advanced Training, you'll need Brotch Calus in Bruma or Ardaline in Bravil."
Mages Guild "All of the local guild halls sell some amount of Alchemic ingredients, but for the best stuff, you'll need to do some exploring on your own."