Calamity Mod Wiki
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
Rover DriveRover Drive 0
During the 20 second cooldown.
When 10 second defense boost is active.
Aquatic EmblemAquatic Emblem 0 to 30 Gradually builds while submerged in liquid.
Aquatic Scourge (Lore)Aquatic Scourge (Lore) 1
When Well Fed buff is active.
When Well Fed buff is not active.
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.
Fungal CarapaceFungal Carapace 2 Always.
Polaris ParrotfishPolaris Parrotfish 2 When Polaris Boost buff is active.
Sea ShellSea Shell 2
When submerged in liquid.
Shield of the OceanShield of the Ocean 2
When submerged in liquid.
Deep DiverDeep Diver 2
When submerged in liquid.
Corrupt FlaskCorrupt Flask 3 While in the Corruption.
Crimson FlaskCrimson Flask 3 While in the Crimson.
Archaic PowderArchaic Powder 3 While Underground or in the Underworld.
Craw CarapaceCraw Carapace 3 Always.
Ethereal ExtorterEthereal Extorter 3
While in the Glowing Mushroom biome.
While in the Snow biome.
While in the Abyss.
Frost BarrierFrost Barrier 4 Always.
Ambrosial AmpouleAmbrosial Ampoule 4 Always.
Lunatic Cultist (Lore)Lunatic Cultist (Lore) 4 While the Lunar Events are active.
Crabulon (Lore)Crabulon (Lore) 5 When Mushy buff is active.
CrabulonCrabulon 5 When Mushy buff is active.
ShroomerangShroomerang 5 When Mushy buff is active.
Gladiator's LocketGladiator's Locket 5 Always.
Spirit GlyphSpirit Glyph 5 When Spirit Defense buff is active.
Living DewLiving Dew 5 While in the Jungle.
Honey DewHoney Dew 5 While in the Jungle.
TequilaTequila 5 During the daytime when Tequila debuff is active.
Artemis EmblemArtemis Emblem 5 Always.
Elemental QuiverElemental Quiver 5 Always.
The Desert Scourge (Lore)The Desert Scourge (Lore) 5 While in the Desert or Sunken Sea.
Titan Scale PotionTitan Scale Potion 5
When Titan Scale buff is active.
10 seconds after a true melee strike during the buff.
Yharim's StimulantsYharim's Stimulants 5 When Yharim's Power buff is active.
Yharon's Kindle StaffYharon's Kindle Staff 5 When Son of Yharon buff is active.
Godly Soul ArtifactGodly Soul Artifact 5 When Son of Yharon buff is active.
Resilient CandleResilient Candle 5% When Adamant Will buff is active.
Giant ShellGiant Shell 6 Always.
Cryo StoneCryo Stone 6 Always.
RegenatorRegenator 6 Always.
LaudanumLaudanum 6 Always.
The AbsorberThe Absorber 6
When submerged in liquid.
Hallowed RuneHallowed Rune 7 When Hallowed Defense buff is active.
Ornate ShieldOrnate Shield 8 Always.
Stress PillsStress Pills 8 Always.
Giant Tortoise ShellGiant Tortoise Shell 8 Always.
Frigid BulwarkFrigid Bulwark 8 Always.
Asgard's ValorAsgard's Valor 8 Always.
Elysian AegisElysian Aegis 8
While Elysian Guard is active.
Heart of the ElementsHeart of the Elements 9 Always.
Crown JewelCrown Jewel 10 While under the effects of a damaging debuff.
Asgardian AegisAsgardian Aegis 10
While Elysian Guard is active.
The SpongeThe Sponge 10
When submerged in liquid.
Frost FlareFrost Flare 10 When below 25% life.
MoonshineMoonshine 10 When Moonshine debuff is active.
Crimson EffigyCrimson Effigy 10 When Crimson Effigy buff is active.
Skeletron (Lore)Skeletron (Lore) 10 While in the Dungeon.
Golem (Lore)Golem (Lore) 10 While standing still.
Moon Lord (Lore)Moon Lord (Lore) 10 While gravity is flipped and the Gravity Globe is equipped.
Dark Sun RingDark Sun Ring 10
During day.
During night.
Rampart of DeitiesRampart of Deities 12 Always.
Tequila SunriseTequila Sunrise 15 During the daytime when Tequila Sunrise debuff is active.
Draconic ElixirDraconic Elixir 16 When Draconic Surge buff is active.
AfflictionAffliction 20 While equipped or when Afflicted buff is active
Celestial JewelCelestial Jewel 20 While under the effects of a damaging debuff.
Leviathan AmbergrisLeviathan Ambergris 20 While submerged in water.
Astral ArcanumAstral Arcanum 20 While under the effects of a damaging debuff.
Ursa SergeantUrsa Sergeant 20 Always.
Draedon's HeartDraedon's Heart 25 While standing still.
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.
Fabled Tortoise ShellFabled Tortoise Shell 35 Always.
The AmalgamThe Amalgam 40 While submerged in liquid.
Grape BeerGrape Beer -2 When Grape Beer debuff is active.
King Slime (Lore)King Slime (Lore) -3 Always.
VodkaVodka -4 When Vodka debuff is active.
MargaritaMargarita -6 When Margarita debuff is active.
White WineWhite Wine -6 When White Wine debuff is active.
Star Beam RyeStar Beam Rye -6 When Star Beam Rye debuff is active.
Bloody MaryBloody Mary -6 During a Blood Moon when Bloody Mary debuff is active.
WhiskeyWhiskey -8 When Whiskey debuff is active.
RumRum -8 When Rum debuff is active.
Leviathan and Anahita (Lore)Leviathan and Anahita (Lore) -10 When not submerged in liquid.
Cryogen (Lore)Cryogen (Lore) -10 Always.
The Twins (Lore)The Twins (Lore) -10 When above 50% life.
Caribbean RumCaribbean Rum -12 When Caribbean Rum debuff is active.
Cinnamon RollCinnamon Roll -12 When Cinnamon Roll debuff is active.
Fabsol's VodkaFabsol's Vodka -20 When Fab debuff is active.
EverclearEverclear -40 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
Invisibility PotionInvisibility Potion 5 While Invisibility buff is active when holding a javelin.
Skeletron Prime (Lore)Skeletron Prime (Lore) 5 Always.
Deific AmuletDeific Amulet 10 Always.
Rampart of DeitiesRampart of Deities 20 Always.
Omega Blue armorOmega Blue armor 50 Set bonus.
Reaper Tooth NecklaceReaper Tooth Necklace 100 Always.

Defense Reduction[]

Several weapons can permanently lower an enemy's defense on hit. Note that the enemy's defense will be reset if it gets changed by its AI.

Source Defense Reduction
Corrupted Crusher BladeCorrupted Crusher Blade 5
Majestic GuardMajestic Guard 10
ApoctolithApoctolith 15
Deep Sea DumbbellDeep Sea Dumbbell 15
Grand GuardianGrand Guardian 15
EarthEarth 50
Anti-materiel RifleAnti-materiel Rifle 50
SkullmasherSkullmasher 50
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.