Well, the vikings would simply carve the runes needed to "cast" the spell. Rather than worrying about number of runes you know, and which ones you are using, and the like (which, from my memory of researching it, isn't really that "historical" anyway), I'd say that they know X spells, or X type of spells, and all the runes needed to cast them. If they want to experiment with combining different runes, then assign improv penalties, *and* make them describe which runes they are using, and how they *expect* them to work. You might have some sort of "Theoretical Rune Magic" ability for improvising, as opposed to "Know Troll-Bane Sword spell".
And, of course, the characters need some sort of artistic ability to carve/paint/scratch the runes correctly...
RR
C'est par mon ordre et pour le bien de l'Etat que le porteur du pr�sent a
fait ce qu'il a fait.
- Richelieu
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