Damage Reduction
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- Main article: Combat
Damage Reduction (commomly referred to as DR) is a stat that does exactly what it suggests: It reduces the amount of damage taken by a player or monster. Unlike other combat numbers that are complex calculations, a player's Damage Reduction is determined by simply adding together all Damage Reduction bonuses the player has, whether from equipment or something else like a 
Damage Reduction Potion or 
Leonardo.
Many monsters have Damage Reduction modifiers that affect their defensive stats.
Mechanics
The player's damage reduction while engaged in combat can be calculated as their damage reduction % outside of combat ('Base Damage Reduction'), less any penalties that apply when in combat (such as the Intimidation passive effect present on many 
monsters), all multiplied by the Combat Triangle damage reduction modifier. Damage reduction has a maximum value of 95% and a minimum of 0%, where the in-combat damage reduction can be calculated as:
[math]\displaystyle{ \text{Damage Reduction %} = \min \Big( \max \Big( \Big\lfloor \left ( \text{Base Damage Reduction %} - \text{In-Combat Penalties} \right ) \times \text{Combat Triangle Modifier} \Big\rfloor , 0 \Big), 95 \Big) }[/math]
Where: [math]\displaystyle{ \left \lfloor x \right \rfloor }[/math] is the floor function.
Whenever a player or monster with Damage Reduction greater than 0% would receive damage, the damage taken is reduced. This reduced damage can be calculated as follows:
[math]\displaystyle{ \text{Damage Taken} = \left \lfloor \text{Base Damage} \times \left ( 1 - \frac{\text{Damage Reduction %}}{100} \right ) \right \rfloor }[/math]
Damage Reduction Modifiers
| Source | Type | Damage Reduction | Other Modifiers |
|---|---|---|---|
 Damage Reduction Potion IV |
Item | +10% Damage Reduction | |
 Damage Reduction Potion III |
Item | +6% Damage Reduction | |
 Guardian Amulet |
Item (Amulet, Passive) | +5% Damage Reduction | +10% Attack Interval |
 Holy Aegis |
Prayer |
+5% Damage Reduction | |
 Damage Reduction Potion II |
Item | +4% Damage Reduction | |
 Stone Skin |
Prayer | +3% Damage Reduction | |
 Damage Reduction Potion I |
Item | +2% Damage Reduction | |
 Lake Swim |
Agility Obstacle 6 | +1% Damage Reduction | +3% Chance To Preserve Prayer Points +5% Damage To All Monsters |
| Raft Building |
Agility Obstacle 8 | +1% Damage Reduction | +2% Damage To All Monsters +20 Maximum Hitpoints |
| Frozen Maze |
Agility Obstacle 11 |
+1% Damage Reduction | -20% Ammo Preservation -0.1s Monster Respawn Timer -20% Rune Preservation -3 Prayer Point Cost for Prayers (Prayer Point cost cannot go below 1) |
 Smithing Lesser Relic |
 Item (Consumable) |
+1% Damage Reduction | -5% Smithing Interval +10% Global Evasion |
 Yak |
Item (Summon1, Summon2) | +1% Damage Reduction | |
 Erran |
Pet | +1% Damage Reduction | |
| Leonardo |
Pet | +1% Damage Reduction | |
 Safeguard |
Prayer | +1% Damage Reduction | |
 Martyr |
Prayer |
-1% Damage Reduction | +40% Reflect Damage |
| Spike Trap |
Agility Obstacle 7 | -2% Damage Reduction | -40 Maximum Hitpoints |
 Knight's Summoning Defender |
Item (Shield, Passive) |
-3% Damage Reduction | -0.1s Attack Interval -10% Summoning Familiar Attack Interval |
| Mud Dive |
Agility Obstacle 4 | -4% Damage Reduction | +20 Maximum Hitpoints +5% Melee Accuracy Bonus +2% Melee Max Hit |
 Masquerade Mask |
Item (Consumable) |
-4% Damage Reduction | -25% Thieving Stun Interval +45 Stealth while Thieving |
| Lava Jump |
Agility Obstacle 9 | -6% Damage Reduction | -6% Auto Eat Efficiency -6% Global Mastery XP -0.3s Monster Respawn Timer |
 Merman Pendant |
Item (Amulet, Passive) |
-10% Damage Reduction | -20% Attack Interval All player special attacks are disabled +75% Global Accuracy +50% Max Hit |
Melee Damage Reduction Equipment
Ranged Damage Reduction Equipment
Mage Damage Reduction Equipment
Other Damage Reduction Equipment
Penetrating Enemy Damage Reduction
| Source | Type | Enemy Damage Reduction | Other Modifiers |
|---|---|---|---|
 Penetration Potion I |
Item |
Enemy Damage Reduction is decreased by flat -2% | |
 Weakness Finder Cape |
Item (Cape) |
Enemy Damage Reduction is decreased by flat -2% | |
 Vial of Acid |
Item (Consumable) |
Enemy Damage Reduction is decreased by flat -3% | |
 Penetration Potion II |
Item |
Enemy Damage Reduction is decreased by flat -4% | |
| Pipe Maze |
Agility Obstacle 11 |
Enemy Damage Reduction is decreased by flat -5% | -20% Chance To Double Loot in Combat +5% Damage To Dungeon Monsters |
 Ashtar |
Constellation |
Enemy Damage Reduction is decreased by flat -5% | -5% Attack Interval +8% Auto Eat Efficiency +8% Chance To Double Loot in Combat +8% Damage To Slayer Tasks +5% Flat Slayer Area Effect Negation |
 Spectre |
Item (Summon1, Summon2) |
Enemy Damage Reduction is decreased by flat -5% | |
 Thorned Power Bow |
Item (Weapon) |
Enemy Damage Reduction is decreased by flat -5% | |
 Penetration Potion III |
Item |
Enemy Damage Reduction is decreased by flat -6% | |
 Penetration Potion IV |
Item |
Enemy Damage Reduction is decreased by flat -8% | |
 Ethereal Greataxe |
Item (Weapon) |
Enemy Damage Reduction is decreased by flat -10% | |
 Ethereal Longbow |
Item (Weapon) |
Enemy Damage Reduction is decreased by flat -10% | +30% Ammo Preservation |
 Ethereal Staff |
Item (Weapon) |
Enemy Damage Reduction is decreased by flat -10% |
| Melvor Idle version v1.2.2 (Released: 15th November 2023) | |||||||||||||||||||
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| Reference Tables: Items, Equipment, Experience Table, Upgrading Items, Combat Areas, Slayer Areas, Dungeons, Chest Loot Tables, Monsters, Monster Loot Tables |
