Unless you stumble on some nifty word in the depths of a thesaurus, you're likely gonna need a compound word if you want a single word. Here's a few possibilities:
So far I could come up with some abilities the class should have :
- Spellcasting in armor. ( Gets better at higher levels. )
- Uses intelligence bonus for to melee and missile to hit rolls.
- Likely to begin spell casting at level 4 just like the HexBlade or the SpellThief.
Some ideas I'm toying with is to create something similar like the Artificer's ability to grant enhancement bonuses to weapons and armor.