Defilers Grasp

You grasp a spellcaster, using and unarmed melee attack, and drain their arcane power, fueling your own magic. The target must make a Constitution saving throw against your spell save DC. On a failure, you steal one spell slot of the lowest level they have available (starting with 1st level).

• The stolen spell slot must be used immediately before the end of your turn. If it is not used, it is lost.
• You may use the stolen spell slot to cast a spell you know or have prepared.
• If the target has no spell slots remaining, you instead gain temporary hit points equal to your spellcasting ability modifier (minimum of 1).

At Higher Levels:

• At 5th level, you may attempt to siphon a 1st- or 2nd-level spell slot (caster’s choice).
• At 11th level, you may siphon a 1st- to 3rd-level spell slot (caster’s choice).
• At 17th level, you may siphon a 1st- to 4th-level spell slot (caster’s choice).

Whenever you siphon magic, the area around you briefly withers—small plants blacken, the air crackles with dark energy, and faint tendrils of shadow stretch toward you. The corruption lasts for one minute per level of the spell slot taken.