D&D 5E - D&D 5e -Runes idea?

Anyone can chisel or carve a rune. But to make a Rune, with a capital R, requires magic. Much like a scroll, they're more than words on parchment, the letters themselves are imbued with magical power.
Runes are Old Magic. Really, for flavour, Elemental magic. There are Runes for Earth, Air, Fire, Water, Light, and Darkness.
Any Rune should have an effect that follows its Element.
As it is rare magic, it should be difficult to acquire a Rune, and those capable of making them would seek more than monetary payment (adventure hooks!).
They can be combined so if an item has, say, Air and Light Runes that item could either do an Air thang and a Light thang, or perhaps instead a combined effect - in this example, cast Lightning Bolt for example. Earth and Darkness could imprison the target by sucking them down into the mud. And so on.
Just a thought.

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