I’ll do some tweaks to the concept a little. Where the Rune Fencer has to Elemental Runes that are connected to the Spell; so
Stone Skin: would be the Rune Fencer activating the Earth Rune, etc. Void Fire is his Fire Rune.

As far as the lore, I’ll adjust the gauge to be a Runic Overcharge Meter where the weapon skills contribute to the charge of its elements, based on which element the WS is.

Thanks for all the feedback y’all!