diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effects.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effects.java
index a28f2f5..868db0b 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effects.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effects.java
@@ -14,6 +14,7 @@ import com.willfp.ecoarmor.effects.effects.ExperienceMultiplier;
 import com.willfp.ecoarmor.effects.effects.FallDamageMultiplier;
 import com.willfp.ecoarmor.effects.effects.Flight;
 import com.willfp.ecoarmor.effects.effects.HungerLossMultiplier;
+import com.willfp.ecoarmor.effects.effects.KnockbackMultiplier;
 import com.willfp.ecoarmor.effects.effects.MeleeDamageMultiplier;
 import com.willfp.ecoarmor.effects.effects.RegenerationMultiplier;
 import com.willfp.ecoarmor.effects.effects.SpeedMultiplier;
@@ -49,6 +50,7 @@ public class Effects {
     public static final Effect<?> FLIGHT = new Flight();
     public static final Effect<?> HUNGER_LOSS_MULTIPLIER = new HungerLossMultiplier();
     public static final Effect<?> BOSS_DAMAGE_MULTIPLIER = new BossDamageMultiplier();
+    public static final Effect<?> KNOCKBACK_MULTIPLIER = new KnockbackMultiplier();
 
     /**
      * Get effect matching name.
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/KnockbackMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/KnockbackMultiplier.java
new file mode 100644
index 0000000..3c5f1ec
--- /dev/null
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/KnockbackMultiplier.java
@@ -0,0 +1,39 @@
+package com.willfp.ecoarmor.effects.effects;
+
+import com.willfp.ecoarmor.effects.Effect;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeInstance;
+import org.bukkit.attribute.AttributeModifier;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+public class KnockbackMultiplier extends Effect<Double> {
+    public KnockbackMultiplier() {
+        super("knockback-multiplier", Double.class);
+    }
+
+    @Override
+    protected void onEnable(@NotNull final Player player) {
+        AttributeInstance movementSpeed = player.getAttribute(Attribute.GENERIC_ATTACK_KNOCKBACK);
+        assert movementSpeed != null;
+
+        Double strength = this.getStrengthForPlayer(player);
+
+        if (strength == null) {
+            return;
+        }
+
+        AttributeModifier modifier = new AttributeModifier(this.getUuid(), "kb-multiplier", strength - 1, AttributeModifier.Operation.MULTIPLY_SCALAR_1);
+        if (movementSpeed.getModifiers().stream().noneMatch(attributeModifier -> attributeModifier.getUniqueId().equals(modifier.getUniqueId()))) {
+            movementSpeed.addModifier(modifier);
+        }
+    }
+
+    @Override
+    protected void onDisable(@NotNull final Player player) {
+        AttributeInstance movementSpeed = player.getAttribute(Attribute.GENERIC_MOVEMENT_SPEED);
+        assert movementSpeed != null;
+
+        movementSpeed.removeModifier(new AttributeModifier(this.getUuid(), "kb-multiplier", 0, AttributeModifier.Operation.MULTIPLY_SCALAR_1));
+    }
+}
diff --git a/eco-core/core-plugin/src/main/resources/config.yml b/eco-core/core-plugin/src/main/resources/config.yml
index 4590994..c25ba6d 100644
--- a/eco-core/core-plugin/src/main/resources/config.yml
+++ b/eco-core/core-plugin/src/main/resources/config.yml
@@ -60,4 +60,7 @@ effects:
     enabled: true
   boss-damage-multiplier:
     # Modify boss damage by some multiplier
+    enabled: true
+  knockback-multiplier:
+    # Modify knockback by some multiplier
     enabled: true
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index 66a16f8..38da0f4 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,2 +1,2 @@
-version = 5.0.1
+version = 5.1.0
 plugin-name = EcoArmor
\ No newline at end of file