Did Bezel create his charms in an attempt to add rules to magic?

No, he created the charms a very long time ago (he is much older than he looks), during his quest for magical power. The creation of the charms, along with their destruction and recreation over the ensuing years softened the veil of reality that separates our dimension from the Ledger Domain. This weakened the barrier between realities enough for other magic using humans like Hex or Charmcaster or whoever to tap into the power of the LD, as well as eventually letting them enter the other realm.

The answer hasn’t got any rewards yet.