Trial of Arcane Might (HB EPIC TIERS)

THIS IS NOT A 9TH LEVEL SPELL.  IT IS INTENDED AS A TIER 3 EPIC LEVEL SPELL FOR THOSE USING THE EPIC LEGACY RULES.  ONLY AVAILABLE FOR ARCHMAGE/WIZARD. However, it's your campaign, do as you wish.

You challenge another spellcaster within range to a duel of magical might. You pour your magic through a conduit of energy into a single creature with a spellcasting feature within range that you can see. If your target does not have a spellcasting feature or is unconscious, the spell dissipates harmlessly. The affected creature can choose to contest your power, causing you and the creature to struggle for control over the spell’s energies. If the creature chooses not to contest the spell, it takes 600 arcane damage and the spell ends. While the spell is in effect, either you or the affected creature can take an action to make an Arcana (Spellcasting ability) check contested by an Arcana (Spellcasting ability) check from the other creature. If you or the creature loses two of these contests in a row, the spell ends, and the loser takes 600 arcane damage. If you become unable to maintain concentration on the spell for any reason, you immediately take 600 arcane damage. A creature reduced to 0 hit points by this spell is utterly obliterated.