Rod of the Pact Keeper +2

Rare

Rod, rare (requires attunement by a Warlock) 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, you can regain 1 warlock spell slot as an action while holding the rod. You can’t use this property again until you finish a long rest.

Dragon Slayer (Greatsword)

Rare

Weapon (any sword), rare You gain a +1 bonus to attack and damage rolls made with this magic weapon. When you hit a dragon with this weapon, the dragon takes an extra 3d6 damage of the weapon’s type. For the purpose of this weapon, “dragon” refers to any creature with the dragon type, including dragon turtles and wyverns.