Thoughts on Runic Magic

I'm somewhat torn with what to do with runic magic. There's a couple possible avenues to go with for reincorporating it into a system.

Runes are specialized extensions of Enchantments.

Runes are unassociated with any known form of magic, and instead are symbols that mana and other powers naturally gravitate to, which can then be controlled to cast the spell. Why mana and other powers gravitate to the rune needs to be explained, but possible explanations are influence from the Elder Gods or even the Beginner. Perhaps even some over-arching religious reason, in that of a god or in the belief that runes are a legitimate written form of magic and operate on that belief.

Other than that, I'm not really sure what purpose runes have. It is possible that it can simply be melded into Enchantments, such that they are the same thing (Enchantments can only work off of runes).

Thoughts?