For the benefit of the OP and anyone else, here's an on-line version: http://www.northvegr.org/lore/egils_saga/
And a quick search of that whole site with "rune" as a key suggests that it may well be worth further study. At the very least, it should give a pretty good idea of what the users of runes believed them to be capable of, and what they looked like in use (painting and so on), which is what's needed for creating rules.
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