Been thinking and thought it would be quite cool to have spells that enchant your weapon (Not counting wands or Staves) to cause it's attacks to deal bonus elemental damage based on your intelligence and perhaps some bonus effects (Similar to some looted weapons having 5-9 fire damage with 10% chance to burn sort of thing but an actual skill)
Could be Defensive variants for shields that grant some Marmour/Parmour (Armour of Frost and Fortify already cover that to be honest) and a hefty resistance boost to that element.
Would be nice for us who want to combine might and magic in a thematic Spellblade-y way
