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Message: <blockquote data-quote="Greenfield" data-source="post: 6687760" data-attributes="member: 6669384">For higher level spell casters, the material cost ends up being trivial.  The D&D economy is broken that way.  It's a non-limit.For the 20th level caster, even the after-the-save damage of 90 will most likely prove fatal, so a damage cap is definitely in order.Here's an idea:  Caster isn't immune to the spell, and the spell has an extended casting time with a max damage per round.  Let casting time be defined as Concentration, meaning it can be interrupted by some outside event, or voluntarily by the caster.The caster can prepare whatever bonuses he/she can arrange for their Save, but can never be immune.  This limits the total damage to the caster's hit points.  In essence, when the caster passes out, the spell ends.  Caster can terminate the casting before that point, of course.As for the spell level, area (it should center on the caster) etc., I'll leave that for someone else.<edit>Cute idea just came to mind:  Casters can protect themselves during the spell effect by dismissing prepared spells.  This way it can be used to force Wizards to disarm themselves in order to survive.  Makes it less "End of the world" and gives it broader use. </edit></blockquote>