Reverberation/Radiant Orb Build

How it works:
- You need to be lit (easy w/ Light cantrip)
- Ring 1 applies Radiating Orb, making your target lit (counts as Daylight vs enemies /w Sunlight Sensitivity)
- Ring 2 deals Radiant damage
- This causes Gloves to apply Reverberation
- Lightning Charges also cause the Glove effect
- Radiating Orb is a condition so Boots apply more Reverberation
- This happens for every hit. With Magic Missile you get an extra hit from Necklace, whereas with Eldritch Blast the Necklace gives extra Reverberation on every hit.

This means your Eldritch Blast / Magic Missile will decrease target attack rolls, STR/DEX/CON saves, and can knock enemies Prone. As well as adding Lightning/Radiant damage to every hit.

The Boots apply Reverberation on ANY condition. Ability Drain Illithid Power means any attack can proc the Boots. For a non-caster you can use Boots with Phalar Aluve, and run in/out of Shriek range many times to proc Boots many times.

Note: Thunder immune enemies are immune to Reverberation. Similarly Radiant or Lightning immune enemies will reduce your ability to apply these conditions.

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GLOVES:
Gloves of Belligerent Skies - Chest near Vlaakith in Crèche
When the wearer deals Thunder, Lightning, or Radiant damage, inflict 2 turns of Reverberation.
https://bg3.wiki/wiki/Gloves_of_Belligerent_Skies
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BOOTS:
Boots of Stormy Clamour - Sold by Omeluum
When the wearer inflicts a condition upon a hostile creature, they also inflict 2 turns of Reverberation.
https://bg3.wiki/wiki/Boots_of_Stormy_Clamour
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RINGS:
1) Coruscation Ring - Last Light Inn Cellar
When the wearer deals spell damage while illuminated by a light source, they also inflict Radiating Orb upon the target for 2 turns.
https://baldursgate3.wiki.fextralife.com/Coruscation+Ring

2) Callous Glow Ring - Treasure Room in Gauntlet of Shar
The wearer deals an additional 2 points of Radiant damage against creatures that are illuminated.
https://bg3.wiki/wiki/Callous_Glow_Ring
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NECKLACE:
Eldritch Blast: Spineshudder Amulet - Upstairs in Moonrise
When the wearer deals damage with a ranged Spell Attack, inflict 2 turns of
Reverberation.
https://bg3.wiki/wiki/Spineshudder_Amulet

Magic Missile: Psychic Spark - Sold by Blurg
Shoot an additional dart whenever you cast Magic Missile.
https://baldursgate3.wiki.fextralife.com/Psychic+Spark
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WEAPONS:
Act 1) The Spellsparkler - Waukeen's Rest
When the wielder deals damage with a spell or cantrip, they gain 2 Lightning Charges.
https://baldursgate3.wiki.fextralife.com/The+Spellsparkler

Act 3) Markoheshkir (Bolts of Doom) - Ramazith's Tower
When you deal spell damage, gain 1 Lightning Charge.
https://bg3.wiki/wiki/Markoheshkir

The craziest setup is Dual Wielder feat using both of these staffs.
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Honorable Mentions:
Thunderskin Cloak - Sold in Moonrise
Could be a good choice for a frontline tank.
When a creature with Reverberation deals damage to the wearer, the creature needs to make a Constitution saving throw or become Dazed.
https://bg3.wiki/wiki/Thunderskin_Cloak

Diadem of Arcane Synergy - Looted in Crèche Y'llek
Situational but good if you plan to do weapon attacks, e.g. in a Gish build.
When you inflict a condition, gain Arcane Synergy (adds Spell Casting Ability Modifier to weapon attacks).
https://bg3.wiki/wiki/Diadem_of_Arcane_Synergy

Phalar Aluve (Shriek) - The Underdark
Could wear on a different character, or dual wield with Spellsparkler and run into melee. Adds a lot more conditions and damage to every hit.
Affected entity has 1d4 penalty to all Saving throws. When it is attacked, it takes an additional 1d4 Thunder damage.
https://bg3.wiki/wiki/Phalar_Aluve

Artistry of War
In Act 3 your Wizard can scribe Curriculum of Strategy: Artistry of War, from Ramazith's Tower. This is a 5th level upgrade to Magic Missiles, which deals huge damage: 2d6+6 Force damage per missile. This is 12d6+36 Force damage split across 6 hits, compared to a 5th level Magic Missile which deals 7d4+7 Force damage split across 7 hits (or 8d4+8 across 8 hits w/ the neck). Even scribed this spell is limited to one use per Short Rest.