diff --git a/src/pocketmine/level/format/anvil/Anvil.php b/src/pocketmine/level/format/anvil/Anvil.php
index 6ad4cada8..2cfcae8c3 100644
--- a/src/pocketmine/level/format/anvil/Anvil.php
+++ b/src/pocketmine/level/format/anvil/Anvil.php
@@ -39,7 +39,7 @@ use pocketmine\utils\MainLogger;
 
 class Anvil extends McRegion{
 
-	public static function nbtSerialize(GenericChunk $chunk) : string{
+	public function nbtSerialize(GenericChunk $chunk) : string{
 		$nbt = new CompoundTag("Level", []);
 		$nbt->xPos = new IntTag("xPos", $chunk->getX());
 		$nbt->zPos = new IntTag("zPos", $chunk->getZ());
@@ -99,7 +99,7 @@ class Anvil extends McRegion{
 		return $writer->writeCompressed(ZLIB_ENCODING_DEFLATE, RegionLoader::$COMPRESSION_LEVEL);
 	}
 
-	public static function nbtDeserialize(string $data, LevelProvider $provider = null){
+	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
 			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
@@ -136,7 +136,7 @@ class Anvil extends McRegion{
 			}
 
 			$result = new GenericChunk(
-				$provider,
+				$this,
 				$chunk["xPos"],
 				$chunk["zPos"],
 				$subChunks,
diff --git a/src/pocketmine/level/format/anvil/RegionLoader.php b/src/pocketmine/level/format/anvil/RegionLoader.php
index 9e4719302..f8714df07 100644
--- a/src/pocketmine/level/format/anvil/RegionLoader.php
+++ b/src/pocketmine/level/format/anvil/RegionLoader.php
@@ -19,41 +19,15 @@
  *
 */
 
+declare(strict_types = 1);
+
 namespace pocketmine\level\format\anvil;
 
 use pocketmine\level\format\LevelProvider;
-use pocketmine\level\format\generic\GenericChunk;
 
 class RegionLoader extends \pocketmine\level\format\mcregion\RegionLoader{
 
-	public function __construct(LevelProvider $level, $regionX, $regionZ){
-		$this->x = $regionX;
-		$this->z = $regionZ;
-		$this->levelProvider = $level;
-		$this->filePath = $this->levelProvider->getPath() . "region/r.$regionX.$regionZ.mca";
-		$exists = file_exists($this->filePath);
-		touch($this->filePath);
-		$this->filePointer = fopen($this->filePath, "r+b");
-		stream_set_read_buffer($this->filePointer, 1024 * 16); //16KB
-		stream_set_write_buffer($this->filePointer, 1024 * 16); //16KB
-		if(!$exists){
-			$this->createBlank();
-		}else{
-			$this->loadLocationTable();
-		}
-
-		$this->lastUsed = time();
-	}
-
-	protected function unserializeChunk($data){
-		return Anvil::nbtDeserialize($data, $this->levelProvider);
-	}
-	
-	public function writeChunk(GenericChunk $chunk){
-		$this->lastUsed = time();
-		$chunkData = Anvil::nbtSerialize($chunk);
-		if($chunkData !== false){
-			$this->saveChunk($chunk->getX() - ($this->getX() * 32), $chunk->getZ() - ($this->getZ() * 32), $chunkData);
-		}
+	public function __construct(LevelProvider $level, int $regionX, int $regionZ){
+		parent::__construct($level, $regionX, $regionZ, "mca");
 	}
 }
\ No newline at end of file
diff --git a/src/pocketmine/level/format/mcregion/McRegion.php b/src/pocketmine/level/format/mcregion/McRegion.php
index 3fb8533db..5168a1a60 100644
--- a/src/pocketmine/level/format/mcregion/McRegion.php
+++ b/src/pocketmine/level/format/mcregion/McRegion.php
@@ -43,7 +43,7 @@ class McRegion extends BaseLevelProvider{
 	 *
 	 * @return string
 	 */
-	public static function nbtSerialize(GenericChunk $chunk) : string{
+	public function nbtSerialize(GenericChunk $chunk) : string{
 		$nbt = new CompoundTag("Level", []);
 		$nbt->xPos = new IntTag("xPos", $chunk->getX());
 		$nbt->zPos = new IntTag("zPos", $chunk->getZ());
@@ -110,11 +110,10 @@ class McRegion extends BaseLevelProvider{
 
 	/**
 	 * @param string $data
-	 * @param LevelProvider $provider
 	 *
 	 * @return GenericChunk|null
 	 */
-	public static function nbtDeserialize(string $data, LevelProvider $provider = null){
+	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
 			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
@@ -170,7 +169,7 @@ class McRegion extends BaseLevelProvider{
 			}
 
 			$result = new GenericChunk(
-				$provider,
+				$this,
 				$chunk["xPos"],
 				$chunk["zPos"],
 				$subChunks,
diff --git a/src/pocketmine/level/format/mcregion/RegionLoader.php b/src/pocketmine/level/format/mcregion/RegionLoader.php
index acfa9823a..f813db3e6 100644
--- a/src/pocketmine/level/format/mcregion/RegionLoader.php
+++ b/src/pocketmine/level/format/mcregion/RegionLoader.php
@@ -19,6 +19,8 @@
  *
 */
 
+declare(strict_types = 1);
+
 namespace pocketmine\level\format\mcregion;
 
 use pocketmine\level\format\generic\GenericChunk;
@@ -45,11 +47,11 @@ class RegionLoader{
 
 	public $lastUsed;
 
-	public function __construct(LevelProvider $level, $regionX, $regionZ){
+	public function __construct(LevelProvider $level, int $regionX, int $regionZ, string $fileExtension = "mcr"){
 		$this->x = $regionX;
 		$this->z = $regionZ;
 		$this->levelProvider = $level;
-		$this->filePath = $this->levelProvider->getPath() . "region/r.$regionX.$regionZ.mcr";
+		$this->filePath = $this->levelProvider->getPath() . "region/r.$regionX.$regionZ.$fileExtension";
 		$exists = file_exists($this->filePath);
 		if(!$exists){
 			touch($this->filePath);
@@ -73,11 +75,11 @@ class RegionLoader{
 		}
 	}
 
-	protected function isChunkGenerated($index){
+	protected function isChunkGenerated(int $index) : bool{
 		return !($this->locationTable[$index][0] === 0 or $this->locationTable[$index][1] === 0);
 	}
 
-	public function readChunk($x, $z){
+	public function readChunk(int $x, int $z){
 		$index = self::getChunkOffset($x, $z);
 		if($index < 0 or $index >= 4096){
 			return null;
@@ -111,7 +113,7 @@ class RegionLoader{
 			return null;
 		}
 
-		$chunk = $this->unserializeChunk(fread($this->filePointer, $length - 1));
+		$chunk = $this->levelProvider->nbtDeserialize(fread($this->filePointer, $length - 1));
 		if($chunk instanceof GenericChunk){
 			return $chunk;
 		}else{
@@ -120,15 +122,11 @@ class RegionLoader{
 		}
 	}
 
-	protected function unserializeChunk($data){
-		return McRegion::nbtDeserialize($data, $this->levelProvider);
-	}
-
-	public function chunkExists($x, $z){
+	public function chunkExists(int $x, int $z) : bool{
 		return $this->isChunkGenerated(self::getChunkOffset($x, $z));
 	}
 
-	protected function saveChunk($x, $z, $chunkData){
+	protected function saveChunk(int $x, int $z, string $chunkData){
 		$length = strlen($chunkData) + 1;
 		if($length + 4 > self::MAX_SECTOR_LENGTH){
 			throw new ChunkException("Chunk is too big! " . ($length + 4) . " > " . self::MAX_SECTOR_LENGTH);
@@ -155,7 +153,7 @@ class RegionLoader{
 		}
 	}
 
-	public function removeChunk($x, $z){
+	public function removeChunk(int $x, int $z){
 		$index = self::getChunkOffset($x, $z);
 		$this->locationTable[$index][0] = 0;
 		$this->locationTable[$index][1] = 0;
@@ -163,13 +161,13 @@ class RegionLoader{
 
 	public function writeChunk(GenericChunk $chunk){
 		$this->lastUsed = time();
-		$chunkData = McRegion::nbtSerialize($chunk);
+		$chunkData = $this->levelProvider->nbtSerialize($chunk);
 		if($chunkData !== false){
 			$this->saveChunk($chunk->getX() - ($this->getX() * 32), $chunk->getZ() - ($this->getZ() * 32), $chunkData);
 		}
 	}
 
-	protected static function getChunkOffset($x, $z){
+	protected static function getChunkOffset(int $x, int $z) : int{
 		return $x + ($z << 5);
 	}
 
@@ -179,7 +177,7 @@ class RegionLoader{
 		$this->levelProvider = null;
 	}
 
-	public function doSlowCleanUp(){
+	public function doSlowCleanUp() : int{
 		for($i = 0; $i < 1024; ++$i){
 			if($this->locationTable[$i][0] === 0 or $this->locationTable[$i][1] === 0){
 				continue;
@@ -215,7 +213,7 @@ class RegionLoader{
 		return $n;
 	}
 
-	private function cleanGarbage(){
+	private function cleanGarbage() : int{
 		$sectors = [];
 		foreach($this->locationTable as $index => $data){ //Calculate file usage
 			if($data[0] === 0 or $data[1] === 0){
@@ -295,11 +293,11 @@ class RegionLoader{
 		$this->locationTable = array_fill(0, 1024, [0, 0, 0]);
 	}
 
-	public function getX(){
+	public function getX() : int{
 		return $this->x;
 	}
 
-	public function getZ(){
+	public function getZ() : int{
 		return $this->z;
 	}