I think Larian got spells as right as they can for a single player adventure. Folk have already found game-breaking character builds.
There will be more patches to further refine and balance spells, and I think that they should really optimize Spells for levels 5-9.
Once past level 10 meaningful encounters are hard to make. Level 10 D&D characters are VERY powerful. If I have two attacks I can cast Conjure Elemental and then Cone of Cold for 8-64(!) damage. Or Cone of Cold twice in a turn is taking almost all Act one bosses/minibosses in one turn.
As a dev you run VERY quickly into making interesting things to challenge these New Godlings. The cheap route is enemy leveling with you. Bleh. Or you can have more "standard" mobs. Large battles! Well it turns ouit waiting for twenty enemies and conjures and summons to take thier turn is about the limit to the Engine and my patience.
It CAN be done, and I only trust Larian to make quality high level adventures.
I do not think we will see it though. Not without nerfing the higher level spells to the point where many would rather they didn't. Seventh level is where the "high concept" spells like Reverse Gravity and Plane Shift start. Such things can only live in our imaginations.
