Defense

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Defense.png
(Desktop, Console and Mobile versions)
The defense icon in-game.

Defense is a statistic that determines the change in damage taken per hit. A positive defense stat will reduce the damage taken, while an negative defense stat will increase the damage taken. The damage dealt to an entity will always be at least 1, regardless of defense (with the exception of a player whose multiplayer ally is wearing a Paladin's Shield).[1]

The player's defense can be increased by wearing armor and accessories, and temporarily boosted/decreased by various buffs/debuffs; a player's defense cannot be reduced to below 0.[2]

Non-player entities (enemies, critters, town NPCs, etc.) also have a defense statistic, but it can only be changed by the entity's own mechanics ((Old-gen console and 3DS versions) the only exception is the Ichor debuff, which reduce the entity's defense). Some items have the ability of armor penetration, which, in most cases, allows them to ignore some or all of the entity's defense when calculating damage.

Some forms of damage are impossible to reduce through defense, e.g. damage from damage over time debuffs like Cursed Inferno or from drowning in water. Damage taken from lava, however, can be reduced through defense.

Players

Defense gives a flat reduction in damage, i.e. damage is reduced by a fixed amount per hit (as opposed to a multiplicative damage reduction, which would reduce damage by a percentage and is applied after defense comes into effect). It is calculated after the general ±15% damage randomization.

The formula is as follows:[3]

[math]\displaystyle{ \text{net damage} = \left\lfloor \text{attack damage} - \text{defense} \cdot f \right\rfloor }[/math]

The factor [math]\displaystyle{ f }[/math] is 0.5 / 0.75 / 1. When calculating damage in PvP, it is always 0.5, regardless of world difficulty.

Examples

Atk. dmg Def. Net damage
Classic Mode.png Classic
or PvP (No Team) (on).png PvP		 Expert Mode.png Expert Master Mode.png Master
40 20 30
⌊40 − 20 × 0.5⌋ = 30 		25
⌊40 − 20 × 0.75⌋ = 25 		20
⌊40 − 20 × 1⌋ = 20
40 30 25
⌊40 − 30 × 0.5⌋ = 25 		17
⌊40 − 30 × 0.75⌋ = 17 		10
⌊40 − 30 × 1⌋ = 10
75 20 65
⌊75 − 20 × 0.5⌋ = 65 		60
⌊75 − 20 × 0.75⌋ = 60 		55
⌊75 − 20 × 1⌋ = 55
75 30 60
⌊75 − 30 × 0.5⌋ = 60 		52
⌊75 − 30 × 0.75⌋ = 52 		45
⌊75 − 30 × 1⌋ = 45

Non-player entities

Non-player entities have a defense statistic just like players do, but they do not gain more protection from defense in Expert Mode or Master Mode. They will always change incoming damage by 50% of their defense:

[math]\displaystyle{ \text{net damage} = \left\lfloor \text{attack damage} - \frac{\text{defense}}{2} \right\rfloor }[/math]

Examples

Weapon Net damage
Green SlimeGreen Slime0 defense Chaos ElementalChaos Elemental30 defense PaladinPaladin50 defense SharkronSharkron100 defense Eye of CthulhuEye of Cthulhu-30 defense at low health
Gold BroadswordGold Broadsword15 damage 15 1 (0) 1 (-10) 1 (-35) 30
MeowmereMeowmere200 damage 200 185 175 150 215

Boosts

Armor and accessories

A player's defense score can be increased by equipping armor and accessories. Armor usually consists of three items, granting an additional bonus if all pieces match, the set bonus, which may increase the defense score further. Some accessories grant direct defense boosts (see the following table), but all accessories can also be reforged to have defense-increasing modifiers.

See armor for detailed defense information about every piece of armor.

Item Accessory defense
Cobalt ShieldCobalt Shield1
Obsidian SkullObsidian Skull1
ShackleShackle1
Obsidian ShieldObsidian Shield2
Shield of CthulhuShield of Cthulhu(Desktop, Console and Mobile versions)2
Ankh ShieldAnkh Shield4
Frozen ShieldFrozen Shield(Desktop, Console and Mobile versions)6
Paladin's ShieldPaladin's Shield6
Berserker's GloveBerserker's Glove(Desktop, Console and Mobile versions)8
Flesh KnucklesFlesh Knuckles(Desktop, Console and Mobile versions)8
Hero ShieldHero Shield(Desktop, Console and Mobile versions)10
Item Accessory defense
Moon CharmMoon Charm 3 (only during the night)
Moon ShellMoon Shell 3 (only during the night)
Moon StoneMoon Stone 4 (only during the night)
Sun StoneSun Stone 4 (only during the day)
Celestial ShellCelestial Shell(Desktop, Console and Mobile versions) 4 (during the day)
7 (during the night)
Frozen Turtle ShellFrozen Turtle Shell (Old-gen console and 3DS versions) 30 (when below 25% health)
Modifier Defense
Hard 1
Guarding 2
Armored 3
Warding 4

Buffs and debuffs

Buffs and debuffs can temporarily alter a player's or an enemy's defense. The defense of enemies cannot be increased, only decreased.

Buff/Debuff Buff/debuff defense
Well FedWell Fed 2
Plenty SatisfiedPlenty Satisfied(Desktop, Console and Mobile versions) 3
Exquisitely StuffedExquisitely Stuffed(Desktop, Console and Mobile versions) 4
The Bast DefenseThe Bast Defense(Desktop, Console and Mobile versions) 5
Dryad's BlessingDryad's Blessing(Desktop, Console and Mobile versions) 8
IronskinIronskin 8
TipsyTipsy −4
WeakWeak −4
Ichor (debuff)Ichor (Desktop, Console and Mobile versions)−15 (only for players) / (Old-gen console and 3DS versions)−20
Broken ArmorBroken Armor −50%
Withered ArmorWithered Armor(Desktop, Console and Mobile versions) −50%

Other

These miscellaneous effects increase the player's defense.

Item Defense
Aegis FruitAegis Fruit(Desktop, Console and Mobile versions) 4 (permanently)
Brand of the InfernoBrand of the Inferno(Desktop, Console and Mobile versions) 20 (while guarding)
Sergeant United ShieldSergeant United Shield(Desktop, Console and Mobile versions) 20 (while guarding)

Armor penetration

Desktop version Console version Mobile version
Desktop/Console/Mobile-Only Content: This section's information applies only to the Desktop, Console, and Mobile versions of Terraria.

Armor penetration is a hidden player statistic that determines the effective amount of the entity's defense portion that is ignored when dealing damage to it. This stat only works against non-player entities; it has no effect in PvP. It works by increasing the damage dealt as follows:[4]

  • If the player's total armor penetration is greater than the enemy's defense, the damage is increased by half of the enemy's defense. This means that the entirety of the enemy's defense is effectively ignored (as the enemy's damage reduction by half its defense – see above – is canceled out).
  • If the player's total armor penetration is lower than or equal to the enemy's defense, the damage is increased by half of the armor penetration value. This means that any amount between nearly none and all of the enemy's defense is effectively ignored, depending on the specific values.

See below for examples.

All following armor penetration values are stackable with each other, and all decimals are rounded down in damage calculations.

The following debuffs increases armor penetration when calculating damage towards affected entities:

Debuff Armor penetration
Ichor (debuff) Ichor 15
Betsy's Curse Betsy's Curse 40

The following items grant armor penetration:

Item Armor penetration
Shark Tooth Necklace Shark Tooth Necklace 5
Stinger Necklace Stinger Necklace 5
Sharpening Station Sharpening Station 12 (only while holding a melee weapon)
Hive Pack Hive Pack 5 (for Wasp Gun only)

In addition, the projectiles of certain weapons and accessories have an own armor penetration stat, which is added to the player's armor penetration when inflicting damage upon an enemy with them:[5]

Item Armor penetration
Blade Staff Blade Staff 25
Dark Harvest Dark Harvest("dark energy") 50
Cool Whip Cool Whip(snowflake) 30
Light's Bane Light's Bane(slash of darkness) 5
Blade of Grass Blade of Grass(projectile) 20
Muramasa Muramasa(slash) 5
Bone Glove Bone Glove 25
Crystal Vile Shard Crystal Vile Shard 10
Nettle Burst Nettle Burst 10
Wasp Gun Wasp Gun 10
Star Cloak Star Cloakand its upgrades 25
Arkhalis Arkhalis 20
Weather Pain Weather Pain 10
Flamethrower Flamethrower 15
Elf Melter Elf Melter 15

Examples

Enemy Player
AP		 Increased
damage		 Explanation
Green SlimeGreen Slime0 defense 0 → 0 AP ≤ defense, so increase is AP/2
10 → 0 AP > defense, so increase is defense/2
Chaos ElementalChaos Elemental30 defense 0 → 0 AP ≤ defense, so increase is AP/2 (0% of defense ignored)
10 → 5 AP ≤ defense, so increase is AP/2 (33.33% of defense ignored)
40 → 15 AP > defense, so increase is defense/2 (100% of defense ignored)
Sharkron
Sharkron100 defense 		5 → 2 AP ≤ defense, so increase is AP/2 (4% of defense ignored)
10 → 5 AP ≤ defense, so increase is AP/2 (10% of defense ignored)
40 → 20 AP ≤ defense, so increase is AP/2 (40% of defense ignored)
100 → 50 AP ≤ defense, so increase is AP/2 (100% of defense ignored)
(This is a theoretical example, as it is possible but impractical to maintain 100 AP.)

Maximum defense

The highest possible defense can be attained using the setups described in the following sections.

Desktop version Desktop version, Console version Console version, and Mobile version Mobile version

Pre-Hardmode

The maximum possible defense is 75 / 77 / 81:

Armor (25 defense)
Accessories (25 / 27 / 31 defense)
Buffs (25 defense)

Hardmode

The maximum possible defense is 190 / 200 / 208:

Armor (82 defense)
Accessories (59 / 69 / 77 defense)
Buffs (25 defense)
Other (24 defense)

Guarding with the Brand of the InfernoBrand of the Inferno or Sergeant United ShieldSergeant United Shield
Consuming an Aegis FruitAegis Fruit

Old-gen console version Old-gen console version and Nintendo 3DSNintendo 3DS version version

The maximum possible defense is 128:

Armor (76 defense)
Accessories (42 defense)
  • At night or day (depending on Moon/Sun Stone), at low health
  • Warding modifiers on all accessories
Buffs (10 defense)

Trivia

  • Damage dealt by enemies is doubled in Expert Mode(Desktop, Console and Mobile versions) and tripled in Master Mode(Desktop, Console and Mobile versions) compared to Classic Mode. This means that despite the higher factors of defense in those modes, players will still take more damage than they would in Classic Mode.

See also

History

  • Desktop 1.4.4: Non-player entities can now have negative defense stat. Previously, negative defense will be set to 0.

References

  1. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, methods StrikeNPC() in Terraria.NPC.cs, CalculateDamageNPCsTake() in Terraria.Main.cs, and CalculateDamagePlayersTake() in Terraria.Main.cs.
  2. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, method Update() in Terraria.Player.cs.
  3. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, methods CalculateDamagePlayersTake() in Terraria.Main.cs and CalculateDamagePlayersTakeInPVP() in Terraria.Main.cs.
  4. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, method checkArmorPenetration() in Terraria.NPC.cs.
  5. ↑ Information taken from the Desktop version Desktop 1.4.2.1 source code, method Damage() in Terraria.Projectile.cs. There may be inaccuracies, as the current Desktop version Desktop version is 1.4.4.9.
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