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.
Improve invulnerable save to 4+. The iron hide is a 30 point upgrade. Now, 3+ is the best save you'll get on the Daemon prince, regardless of what you do. The Marks are mutually exclusive; you can go up to T6 or to the 4+ invulnerable save. Really, then, you're looking at Mark of Nurgle +Iron Hide, or Mark of Tzeentch.T6 with a 3+/5+ is durable to lower-strength, lower-AP fire.ut, the Daemon Prince has a critical problem...NO GRENADES. This is why you might consider the mark of Slaanesh or the mark of Nurgle. They may take offensive/defensive grenades as a single upgrade, which let you keep the lovely initiative bonus when you have to charge into cover.