Magic Items

The intense psionic scream of a dying elder brain dragon left a psychic splinter in your brain. For the better or worse it grants you resistance against spells and magical effects. Now you have to just find a way how to deal with the voices in your head!

Weapon (any bow), very rare (requires attunement)
This bow has multiple strings and resembles a lyre or small harp. By strumming the strings while setting an arrow to the bow, you imbue the arrow with magic.
You can play one of the following melodies when you use the bow to make a ranged weapon attack. You must choose to do so before you make the attack roll, and you can play only one melody per attack.
Melody of Precision. If you’re proficient in Performance, you gain a +1 bonus to the attack roll. If you have expertise in Performance, you gain a +2 bonus instead.
Melody of Reverberation. The melody you strum echoes loudly. On a hit, the target takes extra thunder damage equal to your Charisma modifier.
Guardian: The Bow whispers Warnings to it's Owner granting a +2 on Initiative Rolls

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 one warlock spell slot as an action while holding the rod. You can’t use this property again until you finish a long rest.

This wand has 7 charges. With the wand in hand, you can use your action to fire the magic missile spell from the wand—no components required—and expend 1 to 3 of the wand's charges. For each charge you expend beyond 1, the spell's level increases by 1. You can use this wand even if you are incapable of casting spells.

The wand regains 1d6 + 1 expended charges each day at dawn. If you expend the wand's last charge, roll a d20. On a 1, the wand crumbles into ash and is destroyed.

Bonus magic item for reaching 5th level

This flat iron rod has a button on one end. You can use an action to press the button, which causes the rod to become magically fixed in place. Until you or another creature uses an action to push the button again, the rod doesn't move, even if it is defying gravity. The rod can hold up to 8,000 pounds of weight. More weight causes the rod to deactivate and fall. A creature can use an action to make a DC 30 Strength check, moving the fixed rod up to 10 feet on a success.