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For defense mechanics, refer to Defense on the Terraria Wiki

Defense is a player statistic that determines how much damage can be taken per hit. The damage the player takes is reduced by of their defense value. Defense can be increased by equipping armor and accessories, or temporarily boosted by various buffs.

Some forms of damage are impossible to reduce through defense. Damage from health-draining debuffs like Plague or drowning in water are not reduced by defense. Damage taken from lava, however, can be reduced through defense.

Damage Reduction

Main Article: Damage Reduction

Damage Reduction (DR) is a stat alongside defense that decreases damage that both the player and other NPCs take based on a percentage. The player can boost their damage reduction with certain accessories, although it scales diminishingly as more damage reduction is gained.

Defense Boosts

Source Defense Condition
Aquatic EmblemAquatic Emblem 0 to 50 Gradually builds while submerged in liquid.
BaguetteBaguette 2 When Well Fed buff is active.
Delicious MeatDelicious Meat 2 When Well Fed buff is active.
Hadal StewHadal Stew 2 When Well Fed buff is active.
Utensil PokerUtensil Poker 2 When Well Fed buff is active.
Polaris ParrotfishPolaris Parrotfish 2 When Polaris Boost buff is active.
Sea ShellSea Shell 2
+3
Always.
When submerged in liquid.
Shield of the OceanShield of the Ocean 2
+5
Always.
When submerged in liquid.
Corrupt FlaskCorrupt Flask 3 While in the Corruption.
Craw CarapaceCraw Carapace 3 Always.
Crimson FlaskCrimson Flask 3 While in the Crimson.
Frost BarrierFrost Barrier 4 Always.
Stress PillsStress Pills 4 Always.
Artemis EmblemArtemis Emblem 5 Always.
CrabulonCrabulon 5 When Mushy buff is active.
Elemental QuiverElemental Quiver 5 Always.
Gladiator's LocketGladiator's Locket 5 Always.
Honey DewHoney Dew 5 While in the Jungle.
Living DewLiving Dew 5 While in the Jungle.
ShroomerangShroomerang 5 When Mushy buff is active.
TequilaTequila 5 During the daytime when Tequila debuff is active.
Titan Scale PotionTitan Scale Potion 5
+25
When Titan Scale buff is active.
10 seconds after a true melee strike during the buff.
Ambrosial AmpouleAmbrosial Ampoule 6 Always.
Fungal CarapaceFungal Carapace 6 Always.
Giant ShellGiant Shell 6 Always.
RegenatorRegenator 6 Always.
Spirit GlyphSpirit Glyph 6 When Spirit Defense buff is active.
Asgard's ValorAsgard's Valor 8
+16
Always.
When submerged in liquid.
Deep DiverDeep Diver 8
+15
Always.
When submerged in liquid.
Elysian AegisElysian Aegis 8
+40
Always.
While Elysian Guard is active.
Frigid BulwarkFrigid Bulwark 8 Always.
Hallowed RuneHallowed Rune 8 When Hallowed Defense buff is active.
Ornate ShieldOrnate Shield 8 Always.
Yharim's StimulantsYharim's Stimulants 8 When Yharim's Power buff is active.
The AbsorberThe Absorber 10
+3
Always.
When submerged in liquid.
AfflictionAffliction 10 While equipped or when Afflicted buff is active
Archaic PowderArchaic Powder 10 While Underground or in the Underworld.
Asgardian AegisAsgardian Aegis 10
+20
+40
Always.
When submerged in liquid.
While Elysian Guard is active.
Crimson EffigyCrimson Effigy 10 When Crimson Effigy buff is active.
Crown JewelCrown Jewel 10 While under the effects of a damaging debuff.
Dark Sun RingDark Sun Ring 10
+15
Always.
During night or Solar Eclipse.
Frost FlareFrost Flare 10 When below 25% life.
LaudanumLaudanum +10
+15
+20
+30
+50
When Weak debuff is active.
When Darkness debuff is active.
When Ichor debuff is active.
When Blackout or Confused debuff is active.
When Obstructed debuff is active.
MoonshineMoonshine 10 When Moonshine debuff is active.
Rover DriveRover Drive 10 When 10-second shield is active.
Tequila SunriseTequila Sunrise 10 During the daytime when Tequila Sunrise debuff is active.
Giant Tortoise ShellGiant Tortoise Shell 12 Always.
Rampart of DeitiesRampart of Deities 12 Always.
Celestial JewelCelestial Jewel 15 While under the effects of a damaging debuff.
Profaned Soul CrystalProfaned Soul Crystal 15
-15
At night or when submerged in water or honey.
At day or when submerged in lava.
Draconic ElixirDraconic Elixir 16 When Draconic Surge buff is active.
Astral ArcanumAstral Arcanum 20 While under the effects of a damaging debuff.
Blood PactBlood Pact 20 When Bloody Boost buff is active.
Leviathan AmbergrisLeviathan Ambergris 20 While submerged in water.
The SpongeThe Sponge 20
+3
Always.
When submerged in liquid.
Ursa SergeantUrsa Sergeant 20 Always.
GraxGrax 30 When Grax Boost buff is active.
Permafrost's ConcoctionPermafrost's Concoction 30 When Encased buff is active.
Yharim's GiftYharim's Gift 30 Always.
Flame-Licked ShellFlame-Licked Shell 36
-18
Always.
When under the Shell Speed Boost buff
Draedon's HeartDraedon's Heart +75% While standing still.
Grape BeerGrape Beer -3% When Grape Beer debuff is active.
Bloody MaryBloody Mary -4% During a Blood Moon when Bloody Mary debuff is active.
RumRum -5% When Rum debuff is active.
VodkaVodka -5% When Vodka debuff is active.
WhiskeyWhiskey -5% When Whiskey debuff is active.
MargaritaMargarita -6% When Margarita debuff is active.
Star Beam RyeStar Beam Rye -6% When Star Beam Rye debuff is active.
White WineWhite Wine -6% When White Wine debuff is active.
Caribbean RumCaribbean Rum -10% When Caribbean Rum debuff is active.
Cinnamon RollCinnamon Roll -10% When Cinnamon Roll debuff is active.
Fabsol's VodkaFabsol's Vodka -10% When Fab debuff is active.
EverclearEverclear -30% When Everclear debuff is active.

Armor Penetration

Armor penetration is a statistic that reduces the defense of the player's targets. For instance, a Purple Slime normally has 6 defense. If the player has 5 Armor penetration and attacks the slime, then the slime will take damage as if it only had 1 defense instead.

Source Armor penetration bonus Condition
Badge of BraveryBadge of Bravery 5 Always.
Invisibility PotionInvisibility Potion 5 While Invisibility buff is active when holding a javelin.
Shadow PotionShadow Potion 5 While Shadow buff is active when holding a javelin.
Filthy GloveFilthy Glove 10 When performing stealth strikes.
Sand Shark Tooth NecklaceSand Shark Tooth Necklace 10 Always.
Reaper Tooth NecklaceReaper Tooth Necklace 15 Always.
Omega Blue armorOmega Blue armor 15 Set bonus.
Electrician's GloveElectrician's Glove 20 When performing stealth strikes.
NanotechNanotech 20 When performing stealth strikes.

Defense Reduction

Several weapons can permanently lower an enemy's defense on hit. These defense reduction effects cannot stack with themselves or each other, unless marked with the + symbol.

Source Defense Reduction
EarthEarth +1
Grand GuardianGrand Guardian +1
Majestic GuardMajestic Guard +1
Corrupted Crusher BladeCorrupted Crusher Blade 10
ApoctolithApoctolith 15
Anti-materiel RifleAnti-materiel Rifle 25
SkullmasherSkullmasher 25
Grand DadGrand Dad Sets non-Boss enemy defense to 0

Vanilla changes

Defensive accessory modifiers now also increase damage reduction and gain more defense in Hardmode and Post-Moon Lord, with rarer defense modifiers granting a larger bonus.

  • Hard provides 0.25% damage reduction; and increases 2 defense in Hardmode and 3 defense in Post-Moon Lord instead of 1.
  • Guarding provides 0.5% damage reduction; and increases 3 defense in Hardmode and 4 defense in Post-Moon Lord instead of 2.
  • Armored provides 0.75% damage reduction; and increases 4 defense in Hardmode and 6 defense in Post-Moon Lord instead of 3.
  • Warding provides 1% damage reduction; and increases 6 defense in Hardmode and 8 defense in Post-Moon Lord instead of 4.

Several items had their defense values changed.

  • A full set of Gladiator armor now provides 21 defense instead of 7.
  • A full set of Obsidian armor now provides 19 defense instead of 16.
  • The Hallowed Plate Mail now provides 18 defense instead of 15 and the Hallowed Greaves now provide 13 defense instead of 11.
  • A full set of Solar Flare armor now provides 94 defense instead of 78.
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