Magic Items

Rod of the Pact Keeper
Rod, very rare (+3) (requires attunement by a warlock)

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.

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.

Defender Dagger
Weapon (any sword), legendary (requires attunement)

You gain a +3 bonus to attack and damage rolls made with this magic weapon.

The first time you attack with the sword on each of your turns, you can transfer some or all of the sword’s bonus to your Armor Class, instead of using the bonus on any attacks that turn. For example, you could reduce the bonus to your attack and damage rolls to +1 and gain a +2 bonus to AC. The adjusted bonuses remain in effect until the start of your next turn, although you must hold the sword to gain a bonus to AC from it.

Crystal Ball of True Seeing
Wondrous item, legendary (requires attunement)

The typical crystal ball, a very rare item, is about 6 inches in diameter. While touching it, you can cast the scrying spell (save DC 17) with it.

While scrying with the crystal ball, you have truesight with a radius of 120 feet centered on the spell’s sensor.