Chaosmancer
Legend
lots of things are just questions of degrees are important.
I think most people would feel a 7th level slot to maybe blind 3 characters for 1 round with a save every round would be mediocre at best.
If a wizard has given up a 7th slot to do this what would you have a fighter give up to achieve the same effect?
5th level slot, not 7th.
But here we have exactly the problem. "Spells get to be more powerful, because they are limited. Therefore you need to give up resources fighter" and then you give no resources to the fighter. And if you try to give resources to the fighter... that's too much like spellcasters and not in the design space of the fighter.
And all of this ignores how those precious spell slots get more and more ubiquitous as the levels go. Sure, a level 2 wizard has 3 precious spell slots. But a level 18 wizard has 22 spell slots, and a few at-will spells, and likely a few spell-like abilities or magical items to give a few more. Suddenly.... less precious.