Dungeon Master's Guide
Rod
Uncommon Requires attunement by a warlock Requires Attunement
While holding this rod, you gain a bonus to spell attack rolls and to the saving throw DCs of your warlock spells. This bonus is determined by the rod's rarity (Rod, uncommon (+1), rare (+2), or very rare (+3) ). In addition, you can regain one warlock spell slot as an action while holding the rod. You can't use this property again until you finish a long rest.
Cost: 500gp
Weight: 1 lb.