Vanilla Changes

Resistance Potion Adjustment

damage * ((0.85^level)-0.05)

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Protection Damage Reduction

damage/sqrt(1+0.75*numProtection)  

Protection: numProtection = 1 * level
BlastProtection: numProtection = 2 * level
FireProtection: numProtection = 2 * level
ProjectileProtection: numProtection = 2 * level
FeatherFalling: numProtection = 3 * level

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Protection

Extends lifespan of items
Can now be applied on any item via Anvil

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Fire Protection

Protects item from fire and lava
Can now be applied on any item via Anvil

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Blast Protection

Protects item from explosions(regardless of strength)
Can now be applied on any item via Anvil

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Projectile Protection

Protects the item from being destroyed by cactus
Can now be applied on any item via Anvil

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Efficiency

[MiningSpeed] += 6+4*Level
Making Efficiency less overpowered beyond level 5

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Impaling

Can now be applied on Sword, Axe & Hoe
Additionally to existing effect, also increases damage against targets in water, rain or bubbles
Incompatible with Sharpness

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Infinity

Infinity can be applied on an empty bucket, causing it to never fill

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Thorns

Can now be applied on all armor pieces
Damage scales with combined levels

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Unbreaking

[ChanceToConsumeDurability] = 1/(1+sqrt(level))
Nerf to Tools, but buff for Armor

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Trident

Trident can now get Sharpness, Smite, Bane of Arthropods, Knockback, Fire Aspect
Trident can now get Power, Punch, Flame