You get Disintegrate at level 11. It can one shot many 11th level characters who have taken a small amount of damage from something else and will reliably one shot characters a couple levels lower. Sounds powerful but still balanced to me, assuming you can't spam long rests at will and do it in every fight.
A lvl 20 Wizard can cast Imprisonment and permanently shrink a level 20 Barbarian inside a gemstone and make a pretty amulet out of it. Not powerful enough?
No, is not.
Disintegrate should disintegrate, not do damage. Simple as that.
Did you played arcanum? Extremely Fortified walls which can sustain multiple grenades can be reduced into dust with a single disintegrate. On Dark Sun : Shattered Sands, is one of the best psionics in the game.
I honestly don't know why so many people see problems with OHK spells which takes out an enemy but sees no problem with domination spells which not only takes out an enemy but also add the same enemy as an ally.
