The closest thing on Glorantha I can think of are the blood crystals, and magic items. Rune stones (and bones, and clay amulets) are undoubtedly common magical foci on Glorantha, so the look is fairly appropriate. I think they will more often be specific deity or entity runes though, and not the great runes as depicted by Mongoose RQ. Such things I'd mostly expect to see associated with sorcerers.
-Adept
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