The red rune is a Frenzy Rune; it can be bought from Tel Mithryn if you have the Dragonborn DLC.
That said, I've also got a mod installed which changes the appearance of runes. That mod would be the Magic Runes HD mod, found here http://www.nexusmods.com/skyrim/mods/41052/?
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That said, I've also got a mod installed which changes the appearance of runes. That mod would be the Magic Runes HD mod, found here http://www.nexusmods.com/skyrim/mods/41052/?