diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index 821037ea1..c1d7d4234 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -687,7 +687,7 @@ class Player extends Human implements CommandSender, InventoryHolder, IPlayer{
 				$chunkZ = $Z + $centerZ;
 				$index = Level::chunkHash($chunkX, $chunkZ);
 				if(!isset($this->usedChunks[$index])){
-					if($this->getLevel()->isChunkPopulated($chunkX, $chunkZ)){
+					if($this->level->isChunkPopulated($chunkX, $chunkZ)){
 						$newOrder[$index] = $distance;
 					}else{
 						$generateQueue->insert([$chunkX, $chunkZ], $distance);
diff --git a/src/pocketmine/block/Block.php b/src/pocketmine/block/Block.php
index 23a271806..3f012addc 100644
--- a/src/pocketmine/block/Block.php
+++ b/src/pocketmine/block/Block.php
@@ -527,142 +527,142 @@ abstract class Block extends Position implements Metadatable{
 	public static function init(){
 		if(count(self::$list) === 0){
 			self::$list = array(
-				self::AIR => new Air(),
-				self::STONE => new Stone(),
-				self::GRASS => new Grass(),
-				self::DIRT => new Dirt(),
-				self::COBBLESTONE => new Cobblestone(),
-				self::PLANKS => new Planks(),
-				self::SAPLING => new Sapling(),
-				self::BEDROCK => new Bedrock(),
-				self::WATER => new Water(),
-				self::STILL_WATER => new StillWater(),
-				self::LAVA => new Lava(),
-				self::STILL_LAVA => new StillLava(),
-				self::SAND => new Sand(),
-				self::GRAVEL => new Gravel(),
-				self::GOLD_ORE => new GoldOre(),
-				self::IRON_ORE => new IronOre(),
-				self::COAL_ORE => new CoalOre(),
-				self::WOOD => new Wood(),
-				self::LEAVES => new Leaves(),
-				self::SPONGE => new Sponge(),
-				self::GLASS => new Glass(),
-				self::LAPIS_ORE => new LapisOre(),
-				self::LAPIS_BLOCK => new Lapis(),
-				self::SANDSTONE => new Sandstone(),
-				self::BED_BLOCK => new Bed(),
-				self::COBWEB => new Cobweb(),
-				self::TALL_GRASS => new TallGrass(),
-				self::DEAD_BUSH => new DeadBush(),
-				self::WOOL => new Wool(),
-				self::DANDELION => new Dandelion(),
-				self::POPPY => new CyanFlower(),
-				self::BROWN_MUSHROOM => new BrownMushroom(),
-				self::RED_MUSHROOM => new RedMushroom(),
-				self::GOLD_BLOCK => new Gold(),
-				self::IRON_BLOCK => new Iron(),
-				self::DOUBLE_SLAB => new DoubleSlab(),
-				self::SLAB => new Slab(),
-				self::BRICKS_BLOCK => new Bricks(),
-				self::TNT => new TNT(),
-				self::BOOKSHELF => new Bookshelf(),
-				self::MOSS_STONE => new MossStone(),
-				self::OBSIDIAN => new Obsidian(),
-				self::TORCH => new Torch(),
-				self::FIRE => new Fire(),
-				self::MONSTER_SPAWNER => new MonsterSpawner(),
-				self::WOOD_STAIRS => new WoodStairs(),
-				self::CHEST => new Chest(),
+				self::AIR => Air::class,
+				self::STONE => Stone::class,
+				self::GRASS => Grass::class,
+				self::DIRT => Dirt::class,
+				self::COBBLESTONE => Cobblestone::class,
+				self::PLANKS => Planks::class,
+				self::SAPLING => Sapling::class,
+				self::BEDROCK => Bedrock::class,
+				self::WATER => Water::class,
+				self::STILL_WATER => StillWater::class,
+				self::LAVA => Lava::class,
+				self::STILL_LAVA => StillLava::class,
+				self::SAND => Sand::class,
+				self::GRAVEL => Gravel::class,
+				self::GOLD_ORE => GoldOre::class,
+				self::IRON_ORE => IronOre::class,
+				self::COAL_ORE => CoalOre::class,
+				self::WOOD => Wood::class,
+				self::LEAVES => Leaves::class,
+				self::SPONGE => Sponge::class,
+				self::GLASS => Glass::class,
+				self::LAPIS_ORE => LapisOre::class,
+				self::LAPIS_BLOCK => Lapis::class,
+				self::SANDSTONE => Sandstone::class,
+				self::BED_BLOCK => Bed::class,
+				self::COBWEB => Cobweb::class,
+				self::TALL_GRASS => TallGrass::class,
+				self::DEAD_BUSH => DeadBush::class,
+				self::WOOL => Wool::class,
+				self::DANDELION => Dandelion::class,
+				self::POPPY => CyanFlower::class,
+				self::BROWN_MUSHROOM => BrownMushroom::class,
+				self::RED_MUSHROOM => RedMushroom::class,
+				self::GOLD_BLOCK => Gold::class,
+				self::IRON_BLOCK => Iron::class,
+				self::DOUBLE_SLAB => DoubleSlab::class,
+				self::SLAB => Slab::class,
+				self::BRICKS_BLOCK => Bricks::class,
+				self::TNT => TNT::class,
+				self::BOOKSHELF => Bookshelf::class,
+				self::MOSS_STONE => MossStone::class,
+				self::OBSIDIAN => Obsidian::class,
+				self::TORCH => Torch::class,
+				self::FIRE => Fire::class,
+				self::MONSTER_SPAWNER => MonsterSpawner::class,
+				self::WOOD_STAIRS => WoodStairs::class,
+				self::CHEST => Chest::class,
 
-				self::DIAMOND_ORE => new DiamondOre(),
-				self::DIAMOND_BLOCK => new Diamond(),
-				self::WORKBENCH => new Workbench(),
-				self::WHEAT_BLOCK => new Wheat(),
-				self::FARMLAND => new Farmland(),
-				self::FURNACE => new Furnace(),
-				self::BURNING_FURNACE => new BurningFurnace(),
-				self::SIGN_POST => new SignPost(),
-				self::WOOD_DOOR_BLOCK => new WoodDoor(),
-				self::LADDER => new Ladder(),
+				self::DIAMOND_ORE => DiamondOre::class,
+				self::DIAMOND_BLOCK => Diamond::class,
+				self::WORKBENCH => Workbench::class,
+				self::WHEAT_BLOCK => Wheat::class,
+				self::FARMLAND => Farmland::class,
+				self::FURNACE => Furnace::class,
+				self::BURNING_FURNACE => BurningFurnace::class,
+				self::SIGN_POST => SignPost::class,
+				self::WOOD_DOOR_BLOCK => WoodDoor::class,
+				self::LADDER => Ladder::class,
 
-				self::COBBLESTONE_STAIRS => new CobblestoneStairs(),
-				self::WALL_SIGN => new WallSign(),
+				self::COBBLESTONE_STAIRS => CobblestoneStairs::class,
+				self::WALL_SIGN => WallSign::class,
 
-				self::IRON_DOOR_BLOCK => new IronDoor(),
-				self::REDSTONE_ORE => new RedstoneOre(),
-				self::GLOWING_REDSTONE_ORE => new GlowingRedstoneOre(),
+				self::IRON_DOOR_BLOCK => IronDoor::class,
+				self::REDSTONE_ORE => RedstoneOre::class,
+				self::GLOWING_REDSTONE_ORE => GlowingRedstoneOre::class,
 
-				self::SNOW_LAYER => new SnowLayer(),
-				self::ICE => new Ice(),
-				self::SNOW_BLOCK => new Snow(),
-				self::CACTUS => new Cactus(),
-				self::CLAY_BLOCK => new Clay(),
-				self::SUGARCANE_BLOCK => new Sugarcane(),
+				self::SNOW_LAYER => SnowLayer::class,
+				self::ICE => Ice::class,
+				self::SNOW_BLOCK => Snow::class,
+				self::CACTUS => Cactus::class,
+				self::CLAY_BLOCK => Clay::class,
+				self::SUGARCANE_BLOCK => Sugarcane::class,
 
-				self::FENCE => new Fence(),
-				self::PUMPKIN => new Pumpkin(),
-				self::NETHERRACK => new Netherrack(),
-				self::SOUL_SAND => new SoulSand(),
-				self::GLOWSTONE_BLOCK => new Glowstone(),
+				self::FENCE => Fence::class,
+				self::PUMPKIN => Pumpkin::class,
+				self::NETHERRACK => Netherrack::class,
+				self::SOUL_SAND => SoulSand::class,
+				self::GLOWSTONE_BLOCK => Glowstone::class,
 
-				self::LIT_PUMPKIN => new LitPumpkin(),
-				self::CAKE_BLOCK => new Cake(),
+				self::LIT_PUMPKIN => LitPumpkin::class,
+				self::CAKE_BLOCK => Cake::class,
 
-				self::TRAPDOOR => new Trapdoor(),
+				self::TRAPDOOR => Trapdoor::class,
 
-				self::STONE_BRICKS => new StoneBricks(),
+				self::STONE_BRICKS => StoneBricks::class,
 
-				self::IRON_BARS => new IronBars(),
-				self::GLASS_PANE => new GlassPane(),
-				self::MELON_BLOCK => new Melon(),
-				self::PUMPKIN_STEM => new PumpkinStem(),
-				self::MELON_STEM => new MelonStem(),
+				self::IRON_BARS => IronBars::class,
+				self::GLASS_PANE => GlassPane::class,
+				self::MELON_BLOCK => Melon::class,
+				self::PUMPKIN_STEM => PumpkinStem::class,
+				self::MELON_STEM => MelonStem::class,
 
-				self::FENCE_GATE => new FenceGate(),
-				self::BRICK_STAIRS => new BrickStairs(),
-				self::STONE_BRICK_STAIRS => new StoneBrickStairs(),
+				self::FENCE_GATE => FenceGate::class,
+				self::BRICK_STAIRS => BrickStairs::class,
+				self::STONE_BRICK_STAIRS => StoneBrickStairs::class,
 
-				self::MYCELIUM => new Mycelium(),
-				self::NETHER_BRICKS => new NetherBrick(),
+				self::MYCELIUM => Mycelium::class,
+				self::NETHER_BRICKS => NetherBrick::class,
 
-				self::NETHER_BRICKS_STAIRS => new NetherBrickStairs(),
+				self::NETHER_BRICKS_STAIRS => NetherBrickStairs::class,
 
-				self::END_PORTAL => new EndPortal(),
-				self::END_STONE => new EndStone(),
-				self::SANDSTONE_STAIRS => new SandstoneStairs(),
-				self::EMERALD_ORE => new EmeraldOre(),
+				self::END_PORTAL => EndPortal::class,
+				self::END_STONE => EndStone::class,
+				self::SANDSTONE_STAIRS => SandstoneStairs::class,
+				self::EMERALD_ORE => EmeraldOre::class,
 
-				self::EMERALD_BLOCK => new Emerald(),
-				self::SPRUCE_WOOD_STAIRS => new SpruceWoodStairs(),
-				self::BIRCH_WOOD_STAIRS => new BirchWoodStairs(),
-				self::JUNGLE_WOOD_STAIRS => new JungleWoodStairs(),
-				self::STONE_WALL => new StoneWall(),
+				self::EMERALD_BLOCK => Emerald::class,
+				self::SPRUCE_WOOD_STAIRS => SpruceWoodStairs::class,
+				self::BIRCH_WOOD_STAIRS => BirchWoodStairs::class,
+				self::JUNGLE_WOOD_STAIRS => JungleWoodStairs::class,
+				self::STONE_WALL => StoneWall::class,
 
-				self::CARROT_BLOCK => new Carrot(),
-				self::POTATO_BLOCK => new Potato(),
+				self::CARROT_BLOCK => Carrot::class,
+				self::POTATO_BLOCK => Potato::class,
 
-				self::QUARTZ_BLOCK => new Quartz(),
-				self::QUARTZ_STAIRS => new QuartzStairs(),
-				self::DOUBLE_WOOD_SLAB => new DoubleWoodSlab(),
-				self::WOOD_SLAB => new WoodSlab(),
-				self::STAINED_CLAY => new StainedClay(),
+				self::QUARTZ_BLOCK => Quartz::class,
+				self::QUARTZ_STAIRS => QuartzStairs::class,
+				self::DOUBLE_WOOD_SLAB => DoubleWoodSlab::class,
+				self::WOOD_SLAB => WoodSlab::class,
+				self::STAINED_CLAY => StainedClay::class,
 
-				self::LEAVES2 => new Leaves2(),
-				self::WOOD2 => new Wood2(),
-				self::ACACIA_WOOD_STAIRS => new AcaciaWoodStairs(),
-				self::DARK_OAK_WOOD_STAIRS => new DarkOakWoodStairs(),
+				self::LEAVES2 => Leaves2::class,
+				self::WOOD2 => Wood2::class,
+				self::ACACIA_WOOD_STAIRS => AcaciaWoodStairs::class,
+				self::DARK_OAK_WOOD_STAIRS => DarkOakWoodStairs::class,
 
-				self::HAY_BALE => new HayBale(),
-				self::CARPET => new Carpet(),
-				self::HARDENED_CLAY => new HardenedClay(),
-				self::COAL_BLOCK => new Coal(),
+				self::HAY_BALE => HayBale::class,
+				self::CARPET => Carpet::class,
+				self::HARDENED_CLAY => HardenedClay::class,
+				self::COAL_BLOCK => Coal::class,
 
-				self::PODZOL => new Podzol(),
-				self::BEETROOT_BLOCK => new Beetroot(),
-				self::STONECUTTER => new Stonecutter(),
-				self::GLOWING_OBSIDIAN => new GlowingObsidian(),
-				self::NETHER_REACTOR => new NetherReactor(),
+				self::PODZOL => Podzol::class,
+				self::BEETROOT_BLOCK => Beetroot::class,
+				self::STONECUTTER => Stonecutter::class,
+				self::GLOWING_OBSIDIAN => GlowingObsidian::class,
+				self::NETHER_REACTOR => NetherReactor::class,
 			);
 		}
 	}
@@ -676,11 +676,12 @@ abstract class Block extends Position implements Metadatable{
 	 */
 	public static function get($id, $meta = 0, Position $pos = null){
 		if(isset(self::$list[$id])){
-			$block = clone self::$list[$id];
-			$block->setDamage($meta);
+			$block = self::$list[$id];
+			$block = new $block($meta);
 		}else{
 			$block = new Generic($id, $meta);
 		}
+
 		if($pos instanceof Position){
 			$block->position($pos);
 		}
diff --git a/src/pocketmine/entity/Entity.php b/src/pocketmine/entity/Entity.php
index e028ee4bd..edc8719c0 100644
--- a/src/pocketmine/entity/Entity.php
+++ b/src/pocketmine/entity/Entity.php
@@ -1055,7 +1055,7 @@ abstract class Entity extends Position implements Metadatable{
 				$level->removeEntity($this);
 			}
 			$this->despawnFromAll();
-			$this->level->release();
+			unset($this->level);
 		}
 	}
 
diff --git a/src/pocketmine/item/Item.php b/src/pocketmine/item/Item.php
index 4d6a53e76..1fbd56b51 100644
--- a/src/pocketmine/item/Item.php
+++ b/src/pocketmine/item/Item.php
@@ -449,7 +449,7 @@ class Item{
 				self::BOW => new Bow(),
 			);
 			foreach(Block::$list as $id => $class){
-				self::$list[$id] = new ItemBlock($class);
+				self::$list[$id] = new ItemBlock(new $class);
 			}
 
 		}
diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index 3411f72d9..6b37c2eeb 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -676,7 +676,6 @@ class Level implements ChunkManager, Metadatable{
 			}
 		}
 
-		//TODO: fix this
 		foreach($this->getCollidingEntities($bb->expand(0.25, 0.25, 0.25), $entity) as $ent){
 			$collides[] = clone $ent->boundingBox;
 		}
@@ -1368,7 +1367,8 @@ class Level implements ChunkManager, Metadatable{
 	 * @return bool
 	 */
 	public function isChunkGenerated($x, $z){
-		return $this->provider->isChunkGenerated($x, $z);
+		$chunk = $this->getChunkAt($x, $z);
+		return $chunk instanceof FullChunk ? $chunk->isGenerated() : false;
 	}
 
 	/**
@@ -1378,7 +1378,8 @@ class Level implements ChunkManager, Metadatable{
 	 * @return bool
 	 */
 	public function isChunkPopulated($x, $z){
-		return $this->provider->isChunkPopulated($x, $z);
+		$chunk = $this->getChunkAt($x, $z);
+		return $chunk instanceof FullChunk ? $chunk->isPopulated() : false;
 	}
 
 	/**
diff --git a/src/pocketmine/level/Position.php b/src/pocketmine/level/Position.php
index 0761eb1c7..91f2bd95a 100644
--- a/src/pocketmine/level/Position.php
+++ b/src/pocketmine/level/Position.php
@@ -25,7 +25,7 @@ use pocketmine\math\Vector3 as Vector3;
 
 class Position extends Vector3{
 
-	/** @var \WeakRef<Level> */
+	/** @var Level */
 	public $level = null;
 
 	/**
@@ -35,32 +35,26 @@ class Position extends Vector3{
 	 * @param Level $level
 	 * @param bool  $strong
 	 */
-	public function __construct($x = 0, $y = 0, $z = 0, Level $level, $strong = false){
+	public function __construct($x = 0, $y = 0, $z = 0, Level $level = null, $strong = false){
 		$this->x = $x;
 		$this->y = $y;
 		$this->z = $z;
-		$this->level = new \WeakRef($level);
-		if($strong === true){
-			$this->level->acquire();
-		}
+		$this->level = $level;
 	}
 
-	public static function fromObject(Vector3 $pos, Level $level, $strong = false){
-		return new Position($pos->x, $pos->y, $pos->z, $level, $strong);
+	public static function fromObject(Vector3 $pos, Level $level = null, $strong = false){
+		return new Position($pos->x, $pos->y, $pos->z, $level);
 	}
 
 	/**
 	 * @return Level
 	 */
 	public function getLevel(){
-		return $this->level->get();
+		return $this->level;
 	}
 
 	public function setLevel(Level $level, $strong = false){
-		$this->level = new \WeakRef($level);
-		if($strong === true){
-			$this->level->acquire();
-		}
+		$this->level = $level;
 	}
 
 	/**
@@ -69,27 +63,31 @@ class Position extends Vector3{
 	 * @return bool
 	 */
 	public function isValid(){
-		return isset($this->level) and $this->level->valid();
+		return isset($this->level) and $this->level instanceof Level;
 	}
 
 	/**
 	 * Marks the level reference as strong so it won't be collected
 	 * by the garbage collector.
 	 *
+	 * @deprecated
+	 *
 	 * @return bool
 	 */
 	public function setStrong(){
-		return $this->level->acquire();
+		return false;
 	}
 
 	/**
 	 * Marks the level reference as weak so it won't have effect against
 	 * the garbage collector decision.
 	 *
+	 * @deprecated
+	 *
 	 * @return bool
 	 */
 	public function setWeak(){
-		return $this->level->release();
+		return false;
 	}
 
 	/**
@@ -107,7 +105,7 @@ class Position extends Vector3{
 			throw new \RuntimeException("Undefined Level reference");
 		}
 
-		return Position::fromObject(parent::getSide($side, $step), $this->getLevel());
+		return Position::fromObject(parent::getSide($side, $step), $this->level);
 	}
 
 	/**
diff --git a/src/pocketmine/level/format/generic/BaseChunk.php b/src/pocketmine/level/format/generic/BaseChunk.php
index 33b248510..b74c6126b 100644
--- a/src/pocketmine/level/format/generic/BaseChunk.php
+++ b/src/pocketmine/level/format/generic/BaseChunk.php
@@ -51,7 +51,7 @@ abstract class BaseChunk extends BaseFullChunk implements Chunk{
 	/** @var int[256] */
 	protected $biomeColors;
 
-	/** @var \WeakRef<LevelProvider> */
+	/** @var LevelProvider */
 	protected $level;
 
 	protected $x;
diff --git a/src/pocketmine/tile/Tile.php b/src/pocketmine/tile/Tile.php
index 55f515f8a..cc14164fe 100644
--- a/src/pocketmine/tile/Tile.php
+++ b/src/pocketmine/tile/Tile.php
@@ -117,7 +117,7 @@ abstract class Tile extends Position{
 			if(($level = $this->getLevel()) instanceof Level){
 				$level->removeTile($this);
 			}
-			$this->level->release();
+			unset($this->level);
 		}
 	}
 
diff --git a/src/pocketmine/utils/Utils.php b/src/pocketmine/utils/Utils.php
index 81b4fec16..400a3ec1a 100644
--- a/src/pocketmine/utils/Utils.php
+++ b/src/pocketmine/utils/Utils.php
@@ -228,9 +228,7 @@ class Utils{
 				PHP_SAPI,
 				(string) PHP_INT_MAX . "." . PHP_INT_SIZE,
 				serialize($_SERVER),
-				serialize(get_defined_constants()),
 				get_current_user(),
-				serialize(ini_get_all()),
 				(string) memory_get_usage() . "." . memory_get_peak_usage(),
 				php_uname(),
 				phpversion(),
@@ -266,7 +264,7 @@ class Utils{
 				$strongEntropyValues = array(
 					is_array($startEntropy) ? hash("sha512", $startEntropy[($rounds + $drop) % count($startEntropy)], true) : hash("sha512", $startEntropy, true), //Get a random index of the startEntropy, or just read it
 					file_exists("/dev/urandom") ? fread(fopen("/dev/urandom", "rb"), 64) : str_repeat("\x00", 64),
-					(function_exists("openssl_random_pseudo_bytes") and version_compare(PHP_VERSION, "5.3.4", ">=")) ? openssl_random_pseudo_bytes(64) : str_repeat("\x00", 64),
+					function_exists("openssl_random_pseudo_bytes") ? openssl_random_pseudo_bytes(64) : str_repeat("\x00", 64),
 					function_exists("mcrypt_create_iv") ? mcrypt_create_iv(64, MCRYPT_DEV_URANDOM) : str_repeat("\x00", 64),
 					$value,
 				);