Also so many times I've heard 'DnD campaigns aren't supposed to go that high', so why exactly do the spells and levels exist in the first place if they are never intended to be used?
Oh also Eldritch Knight in DDO lol, you don't even need spells as a caster - Intelligence to hit and damage and what not -
https://ddowiki.com/page/Wizard_Eldritch_Knight_enhancementsIf your DC was still too low, make a Warforged EK and self heal with reconstruct and go smash stuff like a barbarian.