Damage Reduction

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Damage Reduction (DR) is a stat that decreases damage received by the player or other NPCs based on a percentage. This is different from defense, which decreases damage by flat values. Each percentage point of DR is additive, incrementing a total value that the damage then gets decreased by.

A graph displaying the relationship between the player's DR stat and the percent of damage that gets reduced in actuality.

The Calamity Mod adjusts the effective percentage of this stat for the player with a diminishing scale, with all DR reducing effects (such as Ichor or Cursed Inferno) being calculated after it has been scaled. NPC DR is not affected by this diminishing scaling.

The scaling formula is: 1 - 1(1 + dr)

For example, if the player has 25% DR, it will be scaled to 1 - 1(1 + 0.25) = 0.2, or 20% DR.

Certain debuffs can reduce enemy damage reduction:

  • Ichor decreases damage reduction by 25% and Cursed Inferno reduces it by 20%.
    • Ichor and Cursed Inferno reduce damage reduction differently for select post-Moon Lord bosses.
    • If both debuffs are applied, Ichor will override Cursed Inferno. The other listed debuffs are independent bonuses.
  • Betsy's Curse decreases damage reduction by 34%.
  • War Cleave decreases damage reduction by 25%.
  • Marked decreases damage reduction by 50%.

NPCs with Damage Reduction[edit | edit source]

Some NPCs have natural DR in all modes. Revengeance Mode grants new DR values to many NPCs, including vanilla ones. DR is calculated after defense, the same as damage reduction for the player.

Calamity NPCs[edit | edit source]

Image NPC DR
Jungle Dragon, Yharon Jungle Dragon, Yharon 24-26%
Desert Scourge Body Desert Scourge Body 5%
Desert Scourge Tail Desert Scourge Tail 10%
The Devourer of Gods Body The Devourer of Gods Body 92.5% / 95%
The Devourer of Gods Body The Devourer of Gods Body (Final Phase) 95.5% / 97%
The Leviathan The Leviathan 35%
Anahita Anahita 5%
Ice Shield Ice Shield 50%
The Plaguebringer Goliath The Plaguebringer Goliath 25%
Earth Elemental Earth Elemental 10%
Cloud Elemental Cloud Elemental 5%
Cryogen Cryogen 10%
Cryogen's Shield Cryogen's Shield 40%
Calamitas Calamitas (Phase 1) 15%
Calamitas Calamitas (Phase 2) 15%
Catastrophe Catastrophe (Brother of Calamitas) 15%
Cataclysm Cataclysm (Brother of Calamitas) 15%
Providence, the Profaned Goddess Providence, the Profaned Goddess 25%
Profaned Guardian Profaned Guardian (Offense) 30%
Profaned Guardian Profaned Guardian (Defense) 40%
Profaned Guardian Profaned Guardian (Healer) 15%
Brimstone Elemental Brimstone Elemental (Phase 1) 15%
Brimstone Elemental Brimstone Elemental (Phase 2) 15%
Brimstone Elemental Brimstone Elemental (Phase 3) 15%
Ceaseless Void Ceaseless Void 99.99%
Profaned Guardian Profaned Guardian (Main) 40%
Profaned Guardian Profaned Guardian (Rock) 25%
Profaned Guardian Profaned Guardian (Crystal) 5%
Supreme Calamitas Supreme Calamitas (Phase 1) 70% / 75%
Supreme Calamitas Supreme Calamitas (Phase 2) 70% / 75% (above 10% health)
84% / 90% (below 10% health)
Catastrophe Catastrophe (Brother of Supreme Calamitas) 70% / 75%
Cataclysm Cataclysm (Brother of Supreme Calamitas) 70% / 75%
Despair Stone Despair Stone 35%
Soul Slurper Soul Slurper 15%
Profaned Energy Profaned Energy 10%
Scorn Eater Scorn Eater 5%
Cnidrion Cnidrion 5%
Ravager Ravager (Head) 10%
Ravager Ravager (Body) 40%
Ravager Ravager (Left Claw) 10%
Ravager Ravager (Right Claw) 10%
Ravager Ravager (Left Leg) 15%
Ravager Ravager (Right Leg) 15%
Rock Pillar Rock Pillar 50%
Phantom Spirit Phantom Spirit (Normal) 40%
Shockstorm Shuttle Shockstorm Shuttle 15%
Sand Tortoise Sand Tortoise 25%
Astral Probe Astral Probe 15%
Astrum Deus Probe Astrum Deus Probe (Flying) 20%
Armored Digger Head Armored Digger Head 15%
Armored Digger Body Armored Digger Body 35%
Armored Digger Tail Armored Digger Tail 45%
Polterghast Polterghast (Phase 1) 15%
Necroghast Necroghast (Phase 2) 20%
Necroplasm Necroplasm (Phase 3) 50%
Stasis Probe Stasis Probe 25%
Soul Seeker Soul Seeker 10%
Soul Seeker Soul Seeker (Supreme) 35%
Plaguebringer Plaguebringer 20%
Sepulcher Head Sepulcher Head 99.99%
Sepulcher Body Sepulcher Body 99.99%
Sepulcher Body Sepulcher Body (Weak) 99.99%
Sepulcher Tail Sepulcher Tail 99.99%
Colossal Squid Colossal Squid 5%
Reaper Shark Reaper Shark 15%
Mauler Mauler 5%
Aquatic Scourge Head Aquatic Scourge Head 10%
Aquatic Scourge Body Aquatic Scourge Body 5%
Aquatic Scourge Body Aquatic Scourge Body (Alternate) 5%
Aquatic Scourge Tail Aquatic Scourge Tail 15%
Eidolon Wyrm Eidolon Wyrm (Juvenile) 15%
Eidolon Wyrm Eidolon Wyrm (Adult) 99.99%
Cryon Cryon 10%
Phantom Debris Phantom Debris 10%
Overloaded Soldier Overloaded Soldier 15%
Brimling Brimling 15% (Normal) / 80% (Boosted)
Great Sand Shark Great Sand Shark 25%
Astrum Aureus Astrum Aureus 15%
Big Sightseer Big Sightseer 15%
Small Sightseer Small Sightseer 15%
Aries Aries 15%
Atlas Atlas 15%
Mantis Mantis 15%
Nova Nova 15%
Astralachnea Astralachnea 15%
Astralachnea Astralachnea (On Wall) 15%
Hive Hive 15%
Stellar Culex Stellar Culex 15%
Fusion Feeder Fusion Feeder 15%
Hadarian Hadarian 15%
Aureus Spawn Aureus Spawn 99.99%
Giant Clam Giant Clam 30%
Prism-Back Prism-Back 25%
Blinded Angler Blinded Angler 20%
Clam Clam 25%
Eutrophic Ray Eutrophic Ray 5%
Skyfin Skyfin 5% (Tier 2 & 3)
Nuclear Terror Nuclear Terror 40%
The Old Duke The Old Duke 50% / 0%
Gamma Slime Gamma Slime 15%
Orthocera Orthocera 7.5% (Tier 2)
35% (Tier 3)
Acid Eel Acid Eel 0.05% (Tier 3)
Trilobite Trilobite 25% (Tier 2)
40% (Tier 3)
Flak Crab Flak Crab 40% (Tier 3)
Sulphurous Skater Sulphurous Skater 15% (Tier 3)

Vanilla NPCs[edit | edit source]

These DR values are applied to vanilla NPCs only in Revengeance Mode.

 
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Thorium NPCs[edit | edit source]

These DR values are applied to Thorium Mod NPCs only in Revengeance Mode and if the "RevengeanceAndDeathThoriumBossBuff" configuration option is set to true.

 
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Boss Kill Times[edit | edit source]

Every boss from both Vanilla Terraria and the Calamity Mod has a value associated with it that represents a rough estimate of how long it should take to kill on Revengeance Mode, timed from when it spawns. If the player seems to be taking less than this time (calculated by comparing the boss's life to the time elapsed, i.e. if the boss has <50% health after half the time has elapsed or <25% health after three quarters of the time has elapsed), then the boss will gain extra DR. The DR gained is based on the boss's base DR and how much faster the player is killing the boss. DR is not reduced if the player is taking longer to kill the boss than expected.

The maximum DR gained is (1 - base DR) * 0.5. If the player has not yet defeated the boss, or has the 'Extra Damage Reduction for Bosses' configuration option set to true, the maximum DR gained is (1 - base DR) * 0.75. For example, if the boss has 30% DR, the maximum gained would be: (1 - 0.3) * 0.5 = 0.35 = 35% and (1 - 0.3) * 0.75 = 0.525 = 52.5% for both cases.

A table showing the values for the boss kill times is below:

Kill Time Table[edit | edit source]

Boss Kill Time (seconds)
King Slime 60
Desert Scourge 60
Eye of Cthulhu 90
Crabulon 90
Eater of Worlds 120
Brain of Cthulhu (Creepers) 30
Brain of Cthulhu 90
The Hive Mind (Phase 1) 30
The Hive Mind (Phase 2) 90
The Perforator Hive 120
Queen Bee 120
Skeletron 150
The Slime God (Slimes) 60
The Slime God (Core) 180
Wall of Flesh 120
Cryogen 180
The Twins 180
Brimstone Elemental 180
The Destroyer 180
Aquatic Scourge 120
Skeletron Prime 180
Calamitas (Phase 1) 20
Calamitas (Phase 2) 190
Plantera 180
Anahita and Leviathan 150
Astrum Aureus 180
Golem 150
The Plaguebringer Goliath 180
Duke Fishron 150
Ravager 180
Lunatic Cultist 150
Astrum Deus (Phase 1) 60
Astrum Deus (Phase 2) 120
Moon Lord (Head & Hands) 120
Moon Lord (Core) 240
Profaned Guardians 90
The Dragonfolly 120
Providence, the Profaned Goddess 240
Ceaseless Void (Dark Energies) 20
Storm Weaver (Naked) 90
Signus, Envoy of the Devourer 120
Polterghast 180
The Old Duke 180
The Devourer of Gods (Phase 1) 90
The Devourer of Gods (Phase 2) 180
Jungle Dragon, Yharon (Phase 1, Pre-Darksun) 180
Jungle Dragon, Yharon (Phase 1, Post-Darksun) 120
Jungle Dragon, Yharon (Phase 2) 180
Supreme Calamitas 300

Damage Reduction Boosts[edit | edit source]

Source Damage Reduction (DR) Condition
The CommunityThe Community 0.5% to 5% Depending on bosses killed.
Profaned Soul ArtifactProfaned Soul Artifact 2.5%
5%
0%
When Defensive Guardian is active.
When Offensive Guardian is also active.
If Burnt Out is active, regardless of prior conditions.
Polaris ParrotfishPolaris Parrotfish 1% When Polaris Boost buff is active.
Ethereal ExtorterEthereal Extorter 3%
5%
While in The Underworld.
While in the Abyss.
TequilaTequila 3% When Tequila debuff is active during the daytime.
Lunatic Cultist (Lore)Lunatic Cultist (Lore) 4% While the Lunar Events are active.
The AbsorberThe Absorber 5%
10%
Initially.
When submerged in liquid.
Ambrosial AmpouleAmbrosial Ampoule 5% Always.
Bloodflare CoreBloodflare Core 5%
10%
When below 50% health.
When below 15% health.
Bloody Worm ToothBloody Worm Tooth 5%
10%
Initially.
When below 50% health.
Core of the Blood GodCore of the Blood God 5% Always.
Craw CarapaceCraw Carapace 5% Always.
Cryo StoneCryo Stone 5% Always.
Evergreen GinEvergreen Gin 5% When Evergreen Gin debuff is active.
Leviathan AmbergrisLeviathan Ambergris 5% When outside of liquid.
Living DewLiving Dew 5% While in the Jungle.
Moon Lord (Lore)Moon Lord (Lore) 5% While gravity is flipped and the Gravity Globe is equipped.
MoonshineMoonshine 5% When Moonshine debuff is active.
Sea ShellSea Shell 5% When submerged in liquid.
Spirit GlyphSpirit Glyph 5% When Spirit Defense buff is active.
Titan Scale PotionTitan Scale Potion 5%
15%
When Titan Scale buff is active.
Holding a true melee weapon while Titan Scale buff is active.
Yharim's StimulantsYharim's Stimulants 5% When Yharim's Power buff is active.
AfflictionAffliction 7% While equipped or when Afflicted buff is active
Archaic PowderArchaic Powder 7% While Underground or in the Underworld.
Corrupt FlaskCorrupt Flask 7% While in the Corruption.
Crimson FlaskCrimson Flask 7% While in the Crimson.
Hallowed RuneHallowed Rune 7% When Hallowed Defense buff is active.
Tequila SunriseTequila Sunrise 7% When Tequila Sunrise debuff is active during the daytime.
Asgard's ValorAsgard's Valor 10% While submerged in liquid.
Asgardian AegisAsgardian Aegis 10% While submerged in liquid.
Blazing CoreBlazing Core 10% Always.
Bloody Worm ScarfBloody Worm Scarf 10% Always.
Gael's GreatswordGael's Greatsword 10% When held.
GraxGrax 10% When Grax Boost buff is active.
The SpongeThe Sponge 10%
15%
Initially.
When submerged in liquid.
Frigid BulwarkFrigid Bulwark 15%
20%
When below 50% health.
When below 15% health.
Rampart of DeitiesRampart of Deities 15%
20%
When below 50% health.
When below 15% health.
Leviathan and Anahita (Lore)Leviathan and Anahita (Lore) -5% While not submerged in liquid.
Corruption EffigyCorruption Effigy -20% When Corruption Effigy buff is active.
Void of CalamityVoid of Calamity -30% Always.
Reaper Tooth NecklaceReaper Tooth Necklace Halves damage reduction While player DR is above 0%

Separate Damage Reduction Boosts[edit | edit source]

These boosts directly modify damage taken and are not an additive stat like normal DR - they are multiplicative instead. They are calculated independently to normal DR as well as each other, and are not affected by Calamity's DR scaling.

Source Separate Damage Reduction Condition
Resilient CandleResilient Candle 5% When Adamant Will buff is active.
Tundra LeashTundra Leash 10% When Angry Dog buff is active while moving.
Onyx Excavator KeyOnyx Excavator Key 10% When Onyx Excavator buff is active while moving.
Abyssal Diving SuitAbyssal Diving Suit 15% When damage taken is above 50 while Abyssal Diving Suit Plates buff is active.
Aquatic HeartAquatic Heart 15% When Ice Shield buff is active.
Fearmonger armorFearmonger armor 15% During the Pumpkin Moon or Frost Moon while no bosses are alive.
Trinket of ChiTrinket of Chi 15% When Chi buff is active.
Revengeance Mode 20% Before any boss has been defeated.
Permafrost's ConcoctionPermafrost's Concoction 30% When Encased buff is active.
Adrenaline Meter 50% When the meter is full.
The BeeThe Bee 50% When at full health with a 10-second cooldown.

Notes[edit | edit source]

Trivia[edit | edit source]

  • The kill time-based Damage Reduction system is inspired by a similar mechanic from The Binding of Isaac: Rebirth.