diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effect.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effect.java
index e2e4280..5abb34c 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effect.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/Effect.java
@@ -6,7 +6,7 @@ import lombok.Getter;
 import org.bukkit.event.Listener;
 import org.jetbrains.annotations.NotNull;
 
-public abstract class Effect implements Listener {
+public abstract class Effect<T> implements Listener {
     /**
      * Instance of EcoArmor.
      */
@@ -19,6 +19,11 @@ public abstract class Effect implements Listener {
     @Getter
     private final String name;
 
+    /**
+     * Create a new effect.
+     *
+     * @param name The effect name.
+     */
     protected Effect(@NotNull final String name) {
         this.name = name;
 
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BonusHearts.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BonusHearts.java
index c9b2e82..e568ffd 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BonusHearts.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BonusHearts.java
@@ -9,7 +9,6 @@ import org.bukkit.attribute.AttributeModifier;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.jetbrains.annotations.NotNull;
-import org.w3c.dom.Attr;
 
 import java.util.UUID;
 
@@ -17,7 +16,7 @@ public class BonusHearts extends Effect {
     private static final UUID MODIFIER_UUID = UUID.nameUUIDFromBytes("bonus-hearts".getBytes());
 
     public BonusHearts() {
-        super("bonus-hearts");
+        super("bonus-hearts", ValueType.INT);
     }
 
     @EventHandler
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BowDamageMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BowDamageMultiplier.java
index 21e8d30..acefb1d 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BowDamageMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/BowDamageMultiplier.java
@@ -12,7 +12,7 @@ import org.jetbrains.annotations.NotNull;
 
 public class BowDamageMultiplier extends Effect {
     public BowDamageMultiplier() {
-        super("bow-damage-multiplier");
+        super("bow-damage-multiplier", ValueType.DOUBLE);
     }
 
     @EventHandler
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageMultiplier.java
index 9f567f8..1695c78 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageMultiplier.java
@@ -11,7 +11,7 @@ import org.jetbrains.annotations.NotNull;
 
 public class DamageMultiplier extends Effect {
     public DamageMultiplier() {
-        super("damage-multiplier");
+        super("damage-multiplier", ValueType.DOUBLE);
     }
 
     @EventHandler
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageTakenMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageTakenMultiplier.java
index b14a74e..f11fa5b 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageTakenMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DamageTakenMultiplier.java
@@ -9,7 +9,7 @@ import org.jetbrains.annotations.NotNull;
 
 public class DamageTakenMultiplier extends Effect {
     public DamageTakenMultiplier() {
-        super("damage-taken-multiplier");
+        super("damage-taken-multiplier", ValueType.DOUBLE);
     }
 
     @EventHandler
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DurabilityMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DurabilityMultiplier.java
index 446a827..f6f64cb 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DurabilityMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/DurabilityMultiplier.java
@@ -8,7 +8,7 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.player.PlayerItemDamageEvent;
 import org.jetbrains.annotations.NotNull;
 
-public class DurabilityMultiplier extends Effect {
+public class DurabilityMultiplier extends Effect<Double> {
     public DurabilityMultiplier() {
         super("durability-multiplier");
     }
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/EvadeChance.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/EvadeChance.java
index 09d60d1..7692c1a 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/EvadeChance.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/EvadeChance.java
@@ -8,7 +8,7 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.jetbrains.annotations.NotNull;
 
-public class EvadeChance extends Effect {
+public class EvadeChance extends Effect<Double> {
     public EvadeChance() {
         super("evade-chance");
     }
@@ -25,7 +25,11 @@ public class EvadeChance extends Effect {
 
         Player player = (Player) event.getEntity();
 
-        double chance = ArmorUtils.getEffectStrength(player, this);
+        Double chance = ArmorUtils.getEffectStrength(player, this);
+
+        if (chance == null) {
+            return;
+        }
 
         if (NumberUtils.randFloat(0, 100) < chance) {
             event.setCancelled(true);
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/ExperienceMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/ExperienceMultiplier.java
index 79540f5..d77bc8e 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/ExperienceMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/ExperienceMultiplier.java
@@ -7,7 +7,7 @@ import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.jetbrains.annotations.NotNull;
 
-public class ExperienceMultiplier extends Effect {
+public class ExperienceMultiplier extends Effect<Double> {
     public ExperienceMultiplier() {
         super("experience-multiplier");
     }
@@ -20,9 +20,9 @@ public class ExperienceMultiplier extends Effect {
             return;
         }
 
-        double multiplier = ArmorUtils.getEffectStrength(player, this);
+        Double multiplier = ArmorUtils.getEffectStrength(player, this);
 
-        if (multiplier == 0) {
+        if (multiplier == null) {
             return;
         }
 
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/FallDamageMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/FallDamageMultiplier.java
index 4955bb3..9d0e2ce 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/FallDamageMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/FallDamageMultiplier.java
@@ -7,7 +7,7 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.jetbrains.annotations.NotNull;
 
-public class FallDamageMultiplier extends Effect {
+public class FallDamageMultiplier extends Effect<Double> {
     public FallDamageMultiplier() {
         super("fall-damage-multiplier");
     }
@@ -28,8 +28,8 @@ public class FallDamageMultiplier extends Effect {
 
         Player player = (Player) event.getEntity();
 
-        double multiplier = ArmorUtils.getEffectStrength(player, this);
-        if (multiplier == 0) {
+        Double multiplier = ArmorUtils.getEffectStrength(player, this);
+        if (multiplier == null) {
             return;
         }
 
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/MeleeDamageMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/MeleeDamageMultiplier.java
index 4a3293d..d5c850e 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/MeleeDamageMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/MeleeDamageMultiplier.java
@@ -7,7 +7,7 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.entity.EntityDamageByEntityEvent;
 import org.jetbrains.annotations.NotNull;
 
-public class MeleeDamageMultiplier extends Effect {
+public class MeleeDamageMultiplier extends Effect<Double> {
     public MeleeDamageMultiplier() {
         super("melee-damage-multiplier");
     }
@@ -24,8 +24,8 @@ public class MeleeDamageMultiplier extends Effect {
 
         Player attacker = (Player) event.getDamager();
 
-        double multiplier = ArmorUtils.getEffectStrength(attacker, this);
-        if (multiplier == 0) {
+        Double multiplier = ArmorUtils.getEffectStrength(attacker, this);
+        if (multiplier == null) {
             return;
         }
 
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/RegenerationMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/RegenerationMultiplier.java
index 73e261d..7945904 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/RegenerationMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/RegenerationMultiplier.java
@@ -7,7 +7,7 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.entity.EntityRegainHealthEvent;
 import org.jetbrains.annotations.NotNull;
 
-public class RegenerationMultiplier extends Effect {
+public class RegenerationMultiplier extends Effect<Double> {
     public RegenerationMultiplier() {
         super("regeneration-multiplier");
     }
@@ -24,9 +24,9 @@ public class RegenerationMultiplier extends Effect {
 
         Player player = (Player) event.getEntity();
 
-        double multiplier = ArmorUtils.getEffectStrength(player, this);
+        Double multiplier = ArmorUtils.getEffectStrength(player, this);
 
-        if (multiplier == 0) {
+        if (multiplier == null) {
             return;
         }
 
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/SpeedMutiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/SpeedMutiplier.java
index 8e592ef..d57a09a 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/SpeedMutiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/SpeedMutiplier.java
@@ -12,7 +12,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.UUID;
 
-public class SpeedMutiplier extends Effect {
+public class SpeedMutiplier extends Effect<Double> {
     private static final UUID MODIFIER_UUID = UUID.nameUUIDFromBytes("speed-multiplier".getBytes());
 
     public SpeedMutiplier() {
@@ -27,8 +27,8 @@ public class SpeedMutiplier extends Effect {
         assert movementSpeed != null;
 
         this.getPlugin().getScheduler().runLater(() -> {
-            double multiplier = ArmorUtils.getEffectStrength(player, this);
-            if (multiplier == 0) {
+            Double multiplier = ArmorUtils.getEffectStrength(player, this);
+            if (multiplier == null) {
                 movementSpeed.removeModifier(new AttributeModifier(MODIFIER_UUID, "speed-multiplier", 0, AttributeModifier.Operation.MULTIPLY_SCALAR_1));
             } else {
                 AttributeModifier modifier = new AttributeModifier(MODIFIER_UUID, "speed-multiplier", multiplier - 1, AttributeModifier.Operation.MULTIPLY_SCALAR_1);
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/TridentDamageMultiplier.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/TridentDamageMultiplier.java
index e877ab4..f54ff47 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/TridentDamageMultiplier.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/TridentDamageMultiplier.java
@@ -10,7 +10,7 @@ import org.bukkit.event.entity.EntityDamageByEntityEvent;
 import org.bukkit.projectiles.ProjectileSource;
 import org.jetbrains.annotations.NotNull;
 
-public class TridentDamageMultiplier extends Effect {
+public class TridentDamageMultiplier extends Effect<Double> {
     public TridentDamageMultiplier() {
         super("trident-damage-multiplier");
     }
@@ -37,7 +37,12 @@ public class TridentDamageMultiplier extends Effect {
             return;
         }
 
-        double multiplier = ArmorUtils.getEffectStrength(attacker, this);
+        Double multiplier = ArmorUtils.getEffectStrength(attacker, this);
+
+        if (multiplier == null) {
+            return;
+        }
+
         if (multiplier == 0) {
             return;
         }
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/WarpChance.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/WarpChance.java
index c565640..796de22 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/WarpChance.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/effects/effects/WarpChance.java
@@ -3,7 +3,6 @@ package com.willfp.ecoarmor.effects.effects;
 import com.willfp.eco.util.NumberUtils;
 import com.willfp.ecoarmor.effects.Effect;
 import com.willfp.ecoarmor.sets.util.ArmorUtils;
-import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
 import org.bukkit.entity.LivingEntity;
@@ -13,7 +12,7 @@ import org.bukkit.event.entity.EntityDamageByEntityEvent;
 import org.bukkit.util.Vector;
 import org.jetbrains.annotations.NotNull;
 
-public class WarpChance extends Effect {
+public class WarpChance extends Effect<Double> {
     public WarpChance() {
         super("warp-chance");
     }
@@ -35,7 +34,15 @@ public class WarpChance extends Effect {
         Player player = (Player) event.getDamager();
         LivingEntity victim = (LivingEntity) event.getEntity();
 
-        double chance = ArmorUtils.getEffectStrength(player, this);
+        if (!ArmorUtils.hasEffect(player, this)) {
+            return;
+        }
+
+        Double chance = ArmorUtils.getEffectStrength(player, this);
+
+        if (chance == null) {
+            return;
+        }
 
         if (NumberUtils.randFloat(0, 100) > chance) {
             return;
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/ArmorSet.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/ArmorSet.java
index 3d66191..15c4a11 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/ArmorSet.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/ArmorSet.java
@@ -32,6 +32,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
+@SuppressWarnings("unchecked")
 public class ArmorSet {
     /**
      * Instance of EcoArmor.
@@ -48,7 +49,7 @@ public class ArmorSet {
      * Effects and their strengths.
      */
     @Getter
-    private final Map<Effect, Double> effects = new HashMap<>();
+    private final Map<Effect<?>, Object> effects = new HashMap<>();
 
     /**
      * Potion effects to be applied on equip.
@@ -70,8 +71,8 @@ public class ArmorSet {
         this.name = name;
 
         for (String effectName : EcoArmorConfigs.SETS.getConfig().getConfigurationSection(name + ".set-bonus").getKeys(false)) {
-            Effect effect = Effects.getByName(effectName);
-            double value = EcoArmorConfigs.SETS.getDouble(name + ".set-bonus." + effectName);
+            Effect<?> effect = Effects.getByName(effectName);
+            Object value = EcoArmorConfigs.SETS.getConfig().get(name + ".set-bonus." + effectName);
             effects.put(effect, value);
         }
 
@@ -160,6 +161,17 @@ public class ArmorSet {
         return items.get(slot);
     }
 
+    /**
+     * Get effect strength of effect.
+     *
+     * @param effect The effect to query.
+     * @param <T>    The type of the effect value.
+     * @return The strength.
+     */
+    public <T> T getEffectStrength(@NotNull final Effect<T> effect) {
+        return (T) effects.get(effect);
+    }
+
     @Override
     public boolean equals(final Object o) {
         if (this == o) {
diff --git a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/util/ArmorUtils.java b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/util/ArmorUtils.java
index 240053f..02de847 100644
--- a/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/util/ArmorUtils.java
+++ b/eco-core/core-plugin/src/main/java/com/willfp/ecoarmor/sets/util/ArmorUtils.java
@@ -99,20 +99,18 @@ public class ArmorUtils {
      *
      * @param player The player to test.
      * @param effect The effect to test.
-     * @return The strength, or 0 if not found.
+     * @param <T>    Effect type.
+     * @return The strength, or null if not found.
      */
-    public double getEffectStrength(@NotNull final Player player,
-                                    @NotNull final Effect effect) {
+    @Nullable
+    public <T> T getEffectStrength(@NotNull final Player player,
+                                   @NotNull final Effect<T> effect) {
         ArmorSet set = getSetOnPlayer(player);
         if (set == null) {
-            return 0;
+            return null;
         }
 
-        if (set.getEffects().containsKey(effect)) {
-            return set.getEffects().get(effect);
-        }
-
-        return 0;
+        return set.getEffectStrength(effect);
     }
 
     /**
@@ -123,8 +121,8 @@ public class ArmorUtils {
      * @return If a player has an active effect.
      */
     public boolean hasEffect(@NotNull final Player player,
-                             @NotNull final Effect effect) {
-        return getEffectStrength(player, effect) != 0;
+                             @NotNull final Effect<?> effect) {
+        return getEffectStrength(player, effect) != null;
     }
 
     /**