I've been trying to find more instances of the runes to complete the runic alphabet. Really, I just want to know what they're gonna make the B. Anyway, I've been going through the adventure time comics to try and find some and in issue 32 they show a series of replacement arms for Finn. One is the witches arm, and it is covered in runes, a few that seem new. Since you were one of the top contributors in that article, I figured I'd bring this to your attention.
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Hope this helped!