Diminish magic

Your reach out with your magic to drain some of the power away from another caster's spell, reducing its effectiveness.

You cast this spell as a reaction to another creature within range casting a spell using a 1st level spell slot.

When you cast this spell you choose one option to decrease:  1. Damage or healing. 2. Duration. 3. Saving throw difficulty. If none of these criteria fit the spell being cast it cannot be targeted by this spell.

1. Damage of healing: The spells damage or healing is reduced by 1/2 rounded down.

2. Duration: The spells duration is reduced by 1/2 rounded down.

3. Saving throw difficulty: Any targets affected by this spell that would be entitled to a saving throw can do so with Advantage.

At Higher Levels: When cast at higher levels, you can target a spell that is the same level as the spell slot that you use to cast this spell with. (To diminish a 3rd level Fireball you would have to cast this spell using a 3rd level spell slot.)