To fit the world this will have to be rune magic of some sort. There are some options in Thaumatology that look promising. The original materials for WFRP seem to suggest that this may be limited to enchantment spells alone but the Rune Priest in RoS is capable of a bit more. I will have to do more work on this anyway and it may not take shape until I work out the Norse humans’ system.
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