List of Equipment that Affect Spell DC

This is a comprehensive collection of equipment that affect Spell Save DCs.

Flat Increases to Spell DC

Equipment	Slot	DC Increase	Spell DC Stat-line	Found in Act
Melf's First Staff	Weapons -  Versatile	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	1
Caitiff Staff	Weapons -  Versatile	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3
Despair of Athkatla	Weapons -  Versatile	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3
Staff of the Emperor	Weapons -  Versatile	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3 (Technically between 2 and 3)
Infernal Rapier	Weapons -  One-Handed	+1	High Spellcasting (+1) - Spell Save DC	2
Staff of Spellpower	Weapons -  Versatile	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3
Woe	Weapons -  Versatile	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3
Markoheshkir	Weapons -  Versatile	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3
Armour of Landfall	Armour - Light	+1	High Spellcasting (+1) - Spell Save DC	3
Armour of the Sporekeeper	Armour - Light	+1	Malefic Funghi - The wearer gains a +1 bonus to Spell Save DC and when dealing Necrotic damage, they deal an additional 1Necrotic Damage.	3
Robe of Exquisite Focus	Clothing -	+1	High Spellcasting (+1) - Spell Save DC	2
The Protecty Sparkswall	Clothing -	+1	High Spellcasting (+1) - Spell Save DC	1
Robe of the Weave	Clothing -	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3
Ketheric's Shield	Shields -	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	2
Fistbreaker Helm	Headwear	+1	High Spellcasting (+1) - Spell Save DC	2
Hood of the Weave	Headwear	+2	Arcane Enchantment (+2) - Spell Save DC and Spell attack rolls	3
Cloak of the Weave	Cloaks	+1	Arcane Enchantment (+1) - Spell Save DC and Spell attack rolls	3
Gauntlet of the Tyrant	Gloves	+1	High Spellcasting (+1) - Spell Save DC	3
Helldusk Gloves	Gloves	+1	Infernal Acuity - Spell Save DC and Spell attack rolls	3
Amulet of the Devout	Amulets	+2	High Spellcasting (+2) - Spell Save DC	3
Ring of Feywild Sparks	Rings	+1	You gain a +1 bonus to Spell Save DC.	3

Conditional Increases to Spell DC

Equipment	Slot	Maximum DC Increase	Spell DC Stat-line	Found in Act
Rhapsody	Weapons -  Light	+3	Scarlet Remittance - +1 bonus to Attack rolls, damage, and Spell Save DC for every foe you slay, up to a maximum of +3.	3
Browbeaten Circlet	Headwear	+1	Browbeaten - The wearer gains a +1 bonus to spell save DC while  Threatened	2
The Shadespell Circlet	Headwear	+1	Shadespell - While the wearer is obscured in shadow, their spells gain a +1 bonus to Spell Save DC	1
Hat of Uninhibited Kushigo	Headwear	+1	Lay Bare Their Weakness - After dealing damage with an unarmed attack, the wearer gains a +1 bonus to their spell save DC until the end of their turn.	2
Helmet of Arcane Acuity	Headwear - Light	+10	Battle Acuity - Whenever you deal damage with a weapon attack, you gain  Arcane Acuity for 2 turns.	2
Hat of Fire Acuity	Headwear	+10	Fire Acuity - grants the wearer  Arcane Acuity whenever they deal Fire damage.	2
Hat of Storm Scion's Power	Headwear	+10	Thunderous Acuity - grants  Arcane Acuity whenever the wearer deals Thunder damage.	2
Gloves of Battlemage's Power	Gloves	+10	Battlemage's Power - Whenever your Weapon Attack roll inflicts a condition, you gain  Arcane Acuity	2

Indirect Increases to Spell DC

Equipment	Slot	Spell DC Stat-line	Found in Act
Birthright	Headwear	Charisma +2, up to a maximum of 22.	3
Duke Ravengard's Longsword	Weapons -  Versatile	Charisma +2	3
Hollow's Staff	Weapons -  Versatile	Heightened Necromancy Creatures have Disadvantage on Saving throws against your necromancy spells.	3
Staff of Cherished Necromancy	Weapons -  Versatile	Heightened Necromancy Creatures have Disadvantage on Saving throws against your necromancy spells.	3
Gloves of Belligerent Skies	Gloves	Thunderous Conversion - When the wearer deals Thunder, Lightning, or Radiant damage, inflict 2 turns of  Reverberation upon the target(s)	2
Braindrain Gloves	Gloves	Mental Interference - When you deal Psychic damage, you also inflict  Mental Fatigue for 2 turns.	2
Boots of Stormy Clamour	Boots	Arcane Echomalefaction - When the wearer inflicts a condition upon a hostile creature, they also inflict 2 turns of  Reverberation	1
Spineshudder Amulet	Amulets	Crackling Resonance - When the wearer deals damage with a ranged Spell Attack, inflict 2 turns of  Reverberation on the target(s)	2
Khalid's Gift	Amulets	Wisdom +1 (up to 21)	3
Ring of Spiteful Thunder	Rings	When the wearer deals Thunder damage to a  Reverberating creature, it becomes  Dazed unless it succeeds a Constitution saving throw	2
Ring of Mental Inhibition	Rings	When a foe fails a Saving throw against one of your spells or actions, they gain  Mental Fatigue for 2 turns.	2