Defense

Note: For defense mechanics, refer to Defense on the Terraria Wiki

Defense Boosts

Item	Accessory Defense
Family Heirloom	1
Sea Turtle's Bulwark	2
Champion's Rebuttal	2
Prydwen	2
Blooming Shield	2
Obsidian Scale	3
Ocean's Retaliation	3
Goblin War Shield	4 (while standing still)
Molten Scale	4
The Cape of the Survivor	4
Astro-Beetle Husk	5 (while life shield is present)
Mantle of the Protector	5
Artificer's Shield	2 for every 20 artificer's energy
Ball n' Chain	8
Terrarium Defender	20 (absorbs 25% of damage done to players on your team; only active below 25% life)
Metallurgy Shield	Accessory Defense
Copper Buckler	1
Tin Buckler	1
Iron Shield	1
Lead Shield	1
Silver Bulwark	2
Tungsten Bulwark	2
Gold Aegis	2
Platinum Aegis	2
Thorium Shield	3
Buff / Debuff	Temporary Defense
Bloom Boost	5
Frost Heart	10
Terraria's Kiss	20
Empowerment - Defense	Increases defense by 4/8/12/16
Aura - Holy Shine	Defense of players within aura increased by 10
Holy Defense	Defense of healed allies increased by 20

Damage Reduction Boosts

Item	Source	Damage reduction bonus
Amethyst Ring	+   @	3 (only if damage taken exceeds 4)
The Ring	+ + + + + + + + +   @	4 (only if damage taken exceeds 5)
Fear Monger	/ + 10   @	6%
The Cape of the Survivor	+ +   @	5%
Astro-Beetle Husk	Astro Beetle	5%
Blast Shield	Sold by Weapon Master after defeating Plantera (35 )	10%
Buff	Source	Damage reduction bonus
Protective Energy	Ancient Aegis	Damage reduction for allies increased by 5%
	Turn Undead
	Soul Guard
Aura - Holy Shine	Celestial armor	10%
Parry Stance	Rapier	10% (only after hitting an enemy)
Empowerment - Damage Reduction	Bard items	3%/6%/9%/12%
Lodestone Defense	Lodestone armor	10%/20%/30%

Armor Penetration

Armor penetration is a statistic that reduces the defense of the player's targets. For instance, Abomination normally has 8 defense. If the player has 5 armor penetration, then damage dealt to the Abomination will be calculated using 3 defense instead of 8.

Item	Source	Armor penetration bonus
Dragon's Talon Necklace	+ 6   @	15