Archmage

You have mastered the arcane and can manipulate magic in ways that others find difficult. You gain the following benefits:

• Before you make a spell attack, you can choose to take a -5 penalty to the attack roll. If the attack hits, you add +10 to the attack's damage. But if it misses, you take 1d6 psychic damage for each spell slot used to cast the spell. 
• When you are targeted by a spell that deals damage, you can use your reaction to make a contested Spellcasting check with the spell's caster. If the spell requires you to make a saving throw, you must declare this reaction before you make the save.
  • On a success, you reflect the spell back onto the original caster. No new roll is made. If the original attack beats the original caster's AC, it hits them. If the spell requires a saving throw, the original caster makes one against their own save DC.
  • On a failure, you take double the damage rolled by the original caster. If the spell requires a saving throw, you automatically fail.