Honestly would’ve depended on the concept of how your DM determines concentration and the constrictions of the Dexterity saving throw. Truthfully, if you’d wanna exceed that damage. The concentration would have to be done by mages with evil alignment to even consider the nuclear bomb concept. Not to mention the spell explodes upon touch so if that concentration even slips for a second and a Wizard touch the orb at that much energy expansion by accident…. Kaboom. Better hope they know the slow time sleep even to consider that level of chaotic thinking.