List of equipment that affect Spell Save DC

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

Flat increases to Spell Save DC

Equipment	Slot	DC Increase	Spell DC Stat-line	Found in Act
Melf's First Staff	Main Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	1
Caitiff Staff	Main Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Despair of Athkatla	Main Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Staff of the Emperor	Main Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Infernal Rapier	Main Hand Melee	+1	High Spellcasting You gain a +1 bonus to Spell Save DC.	2
Staff of Spellpower	Main Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Woe	Main Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Markoheshkir	Main Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Armour of Landfall	Clothing	+1	High Spellcasting You gain a +1 bonus to Spell Save DC.	3
Armour of the Sporekeeper	Clothing	+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 You gain a +1 bonus to Spell Save DC.	2
The Protecty Sparkswall	Clothing	+1	High Spellcasting You gain a +1 bonus to Spell Save DC.	1
Robe of the Weave	Clothing	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Ketheric's Shield	Off-Hand Melee	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	2
Fistbreaker Helm	Headgear	+1	High Spellcasting You gain a +1 bonus to Spell Save DC.	2
Hood of the Weave	Headgear	+2	Arcane Enchantment You gain a +2 bonus to Spell Save DC and Spell Attack rolls.	3
Cloak of the Weave	Cloak	+1	Arcane Enchantment You gain a +1 bonus to Spell Save DC and Spell Attack rolls.	3
Gauntlet of the Tyrant	Gloves	+1	High Spellcasting You gain a +1 bonus to Spell Save DC.	3
Helldusk Gloves	Gloves	+1	Infernal Acuity You gain +1 bonus to Spell Attack Rolls[See Notes] and Spell Save DC.	3
Amulet of the Devout	Amulet	+2	High Spellcasting You gain a +2 bonus to Spell Save DC.	3
Ring of Feywild Sparks	Ring	+1	You gain a +1 bonus to Spell Save DC.	3

Conditional increases to Spell Save DC

Equipment	Slot	Maximum DC Increase	Spell DC Stat-line	Found in Act
Rhapsody	Main Hand Melee	+3	Scarlet Remittance Gain a +1 bonus to Attack rolls, damage, and Spell Save DC for every foe you slay, up to a maximum of +3.	3
Browbeaten Circlet	Headgear	+1	Browbeaten The wearer gains a +1 bonus to spell save DC while  Threatened.	2
The Shadespell Circlet	Headgear	+1	Shadespell While the wearer is obscured in shadow, their spells gain a +1 bonus to Spell Save DC, making them more likely to succeed.	1
Hat of Uninhibited Kushigo	Headgear	+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	Headgear	+10	Battle Acuity Whenever you deal damage with a weapon attack, you gain  Arcane Acuity for 2 turns.	2
Hat of Fire Acuity	Headgear	+10	Fire Acuity Whenever you deal Fire damage, you gain  Arcane Acuity for 2 turns.	2
Hat of Storm Scion's Power	Headgear	+10	Thunderous Acuity Whenever the wearer deals Thunder damage, they gain  Arcane Acuity.	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 Save DC

Equipment	Slot	Spell DC Stat-line	Found in Act
Birthright	Headgear	Charisma +2, up to a maximum of 22.	3
Duke Ravengard's Longsword	Main Hand Melee	Charisma +2	3
Hollow's Staff	Main Hand Melee	Heightened Necromancy Creatures have Disadvantage on Saving throws against your necromancy spells.	3
Staff of Cherished Necromancy	Main Hand Melee	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	Amulet	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	Amulet	Wisdom +1 (up to 21)	3
Ring of Spiteful Thunder	Ring	Spiteful Thunder 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	Ring	Mental Inhibition When a foe fails a Saving throw against one of your spells or actions, they gain  Mental Fatigue for 2 turns.	2