In addition to incantation, how about improving spell effects and move away from DOS and more to the core D&D RPG animations? This can easily work in turn-based as I've witnessed it done amazing in a turn-based D&D game in development now.

When I think of Baldurs gate I like to see magic missile, lightning bolt, summoning circles etc.

Example Magic Missile spell effect
https://www.artstation.com/artwork/2420B