The Fey's Cursed Blessing

General Feat (Prerequisite: Level 8+)

You made a deal with a fey asking for great power, gaining the ability to cast powerful spells with less strain.

Trial of Glamour. When casting a Transmutation, Illusion, or Enchantment spell requiring Concentration, you can choose to cast it without Concentration. When you do, make a Constitution Saving Throw with (DC 10 + the spell's level). On a success, you cast the Spell without Concentration; the spell lasts it's normal duration or up to 10 minutes. On a failure you take Psychic Damage equal to the spell's level times d6, and both you and the affected creatures suffer the normal consequences of losing Concentration on that spell.