Likely a sterile medium means an uncontaminated culture (food free of living organisms) that will grow only the new bacteria introduced for analysis. Source(s): http://www.thefreedictionary.com/sterile
Stonepelt was Bluestar's first mentor and a very well-respected senior warrior of ThunderClan. It is revealed in this book that he took her to the Gathering on her second day as an apprentice because she had caught a squirrel very well for a new apprentice, and the squirrel had been as big as she was.
Edit Page Last Edit: November 3, 2016 - 5 months 13 days ago. This quest becomes available immediately after completing A Deadly Plot. If you didn't play Thaler right after the quest finished. You can find him in Novigrad at the Seven Cats Inn. The reward for defeating Thaler is the Geralt of Rivia hero card.