Muted Spellcasting

You have learned how to cast spells without speaking arcane words of power out loud, albeit with unstable results. You gain the following benefits:

• Increase your Intelligence or Wisdom score by 1, to a maximum of 20.
• You may choose to mentally recite the verbal components when casting spells instead of speaking out loud. If you do, roll 1d20. On a 1, the spell backfires, and you take 1d4 psychic damage for each level of the spell (minimum 1d4). This still uses up a spell slot of the type chosen. On a 2, you lose concentration on the spell, and it dissipates harmlessly. This still uses up a spell slot of the type chosen. On a 3-20, the spell is cast normally. This ability functions within the effect of a silence spell.