While holding this rod, you gain a +2 bonus to spell attack rolls and to the saving throw DCs of your warlock spells. In addition, once per long rest you can use Astral Feast.
Astral Feast. You use an action to magically sup on the essence of a creature within 60 feet. The target must make a Constitution saving throw against your spell save DC. It takes 8d6 necrotic damage on a failed save, or half that amount on a success. You then immediately regain a Pact Magic slot.

Notes: Bonus: Warlock Spell Attacks, Bonus: Warlock Spell Save DC, Warlock, Buff