diff --git a/src/main/java/net/minestom/server/world/biomes/Biome.java b/src/main/java/net/minestom/server/world/biomes/Biome.java
index dd9a124cc..a5d9bf628 100644
--- a/src/main/java/net/minestom/server/world/biomes/Biome.java
+++ b/src/main/java/net/minestom/server/world/biomes/Biome.java
@@ -5,6 +5,8 @@ import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.ToString;
 import net.minestom.server.utils.NamespaceID;
+import net.minestom.server.utils.validate.Check;
+import org.jetbrains.annotations.NotNull;
 import org.jglrxavpok.hephaistos.nbt.NBTCompound;
 
 import java.util.concurrent.atomic.AtomicInteger;
@@ -15,95 +17,102 @@ import java.util.concurrent.atomic.AtomicInteger;
 @EqualsAndHashCode
 public class Biome {
 
-	public static final AtomicInteger idCounter = new AtomicInteger(0);
+    public static final AtomicInteger idCounter = new AtomicInteger(0);
 
-	//A plains biome has to be registered or else minecraft will crash
-	public static final Biome PLAINS = Biome.builder()
-			.category(Category.NONE)
-			.name(NamespaceID.from("minecraft:plains"))
-			.temperature(0.8F)
-			.downfall(0.4F)
-			.depth(0.125F)
-			.scale(0.05F)
-			.effects(BiomeEffects.builder()
-					.fog_color(0xC0D8FF)
-					.sky_color(0x78A7FF)
-					.water_color(0x3F76E4)
-					.water_fog_color(0x50533)
-					.build())
-			.build();
+    private static final BiomeEffects DEFAULT_EFFECTS = BiomeEffects.builder()
+            .fog_color(0xC0D8FF)
+            .sky_color(0x78A7FF)
+            .water_color(0x3F76E4)
+            .water_fog_color(0x50533)
+            .build();
 
-	private final int id = idCounter.getAndIncrement();
+    //A plains biome has to be registered or else minecraft will crash
+    public static final Biome PLAINS = Biome.builder()
+            .category(Category.NONE)
+            .name(NamespaceID.from("minecraft:plains"))
+            .temperature(0.8F)
+            .downfall(0.4F)
+            .depth(0.125F)
+            .scale(0.05F)
+            .effects(DEFAULT_EFFECTS)
+            .build();
 
-	private final NamespaceID name;
-	@Builder.Default
-	private final float depth = 0.2F;
-	@Builder.Default
-	private final float temperature = 0.25F;
-	@Builder.Default
-	private final float scale = 0.2F;
-	@Builder.Default
-	private final float downfall = 0.8F;
-	@Builder.Default
-	private final Category category = Category.NONE;
-	private final BiomeEffects effects;
-	@Builder.Default
-	private final Precipitation precipitation = Precipitation.RAIN;
-	@Builder.Default
-	private final TemperatureModifier temperature_modifier = TemperatureModifier.NONE;
+    private final int id = idCounter.getAndIncrement();
 
-	public NBTCompound toNbt() {
-		NBTCompound nbt = new NBTCompound();
-		nbt.setString("name", name.toString());
-		nbt.setInt("id", getId());
+    private final NamespaceID name;
+    @Builder.Default
+    private final float depth = 0.2F;
+    @Builder.Default
+    private final float temperature = 0.25F;
+    @Builder.Default
+    private final float scale = 0.2F;
+    @Builder.Default
+    private final float downfall = 0.8F;
+    @Builder.Default
+    private final Category category = Category.NONE;
+    @Builder.Default
+    private final BiomeEffects effects = DEFAULT_EFFECTS;
+    @Builder.Default
+    private final Precipitation precipitation = Precipitation.RAIN;
+    @Builder.Default
+    private final TemperatureModifier temperature_modifier = TemperatureModifier.NONE;
 
-		NBTCompound element = new NBTCompound();
-		element.setFloat("depth", depth);
-		element.setFloat("temperature", temperature);
-		element.setFloat("scale", scale);
-		element.setFloat("downfall", downfall);
-		element.setString("category", category.getType());
-		element.setString("precipitation", precipitation.getType());
-		if (temperature_modifier != TemperatureModifier.NONE)
-			element.setString("temperature_modifier", temperature_modifier.getType());
-		element.set("effects", effects.toNbt());
-		nbt.set("element", element);
-		return nbt;
-	}
+    @NotNull
+    public NBTCompound toNbt() {
+        Check.notNull(name, "The biome namespace cannot be null");
+        Check.notNull(effects, "The biome effects cannot be null");
 
-	public enum Precipitation {
-		RAIN("rain"), NONE("none"), SNOW("snow");
+        NBTCompound nbt = new NBTCompound();
+        nbt.setString("name", name.toString());
+        nbt.setInt("id", getId());
 
-		@Getter
-		String type;
+        NBTCompound element = new NBTCompound();
+        element.setFloat("depth", depth);
+        element.setFloat("temperature", temperature);
+        element.setFloat("scale", scale);
+        element.setFloat("downfall", downfall);
+        element.setString("category", category.getType());
+        element.setString("precipitation", precipitation.getType());
+        if (temperature_modifier != TemperatureModifier.NONE)
+            element.setString("temperature_modifier", temperature_modifier.getType());
+        element.set("effects", effects.toNbt());
+        nbt.set("element", element);
+        return nbt;
+    }
 
-		Precipitation(String type) {
-			this.type = type;
-		}
-	}
+    public enum Precipitation {
+        RAIN("rain"), NONE("none"), SNOW("snow");
 
-	public enum Category {
-		NONE("none"), TAIGA("taiga"), EXTREME_HILLS("extreme_hills"), JUNGLE("jungle"), MESA("mesa"), PLAINS("plains"),
-		SAVANNA("savanna"), ICY("icy"), THE_END("the_end"), BEACH("beach"), FOREST("forest"), OCEAN("ocean"),
-		DESERT("desert"), RIVER("river"), SWAMP("swamp"), MUSHROOM("mushroom"), NETHER("nether");
+        @Getter
+        String type;
 
-		@Getter
-		String type;
+        Precipitation(String type) {
+            this.type = type;
+        }
+    }
 
-		Category(String type) {
-			this.type = type;
-		}
-	}
+    public enum Category {
+        NONE("none"), TAIGA("taiga"), EXTREME_HILLS("extreme_hills"), JUNGLE("jungle"), MESA("mesa"), PLAINS("plains"),
+        SAVANNA("savanna"), ICY("icy"), THE_END("the_end"), BEACH("beach"), FOREST("forest"), OCEAN("ocean"),
+        DESERT("desert"), RIVER("river"), SWAMP("swamp"), MUSHROOM("mushroom"), NETHER("nether");
 
-	public enum TemperatureModifier {
-		NONE("none"), FROZEN("frozen");
+        @Getter
+        String type;
 
-		@Getter
-		String type;
+        Category(String type) {
+            this.type = type;
+        }
+    }
 
-		TemperatureModifier(String type) {
-			this.type = type;
-		}
-	}
+    public enum TemperatureModifier {
+        NONE("none"), FROZEN("frozen");
+
+        @Getter
+        String type;
+
+        TemperatureModifier(String type) {
+            this.type = type;
+        }
+    }
 
 }