diff --git a/src/block/inventory/DoubleChestInventory.php b/src/block/inventory/DoubleChestInventory.php
index b26425eab..033a06548 100644
--- a/src/block/inventory/DoubleChestInventory.php
+++ b/src/block/inventory/DoubleChestInventory.php
@@ -41,7 +41,7 @@ class DoubleChestInventory extends BaseInventory implements BlockInventory, Inve
 		parent::__construct();
 	}
 
-	public function getInventory(){
+	public function getInventory() : self{
 		return $this;
 	}
 
diff --git a/src/block/tile/Barrel.php b/src/block/tile/Barrel.php
index e6978fca9..8035947ed 100644
--- a/src/block/tile/Barrel.php
+++ b/src/block/tile/Barrel.php
@@ -56,17 +56,11 @@ class Barrel extends Spawnable implements Container, Nameable{
 		}
 	}
 
-	/**
-	 * @return BarrelInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : BarrelInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return BarrelInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : BarrelInventory{
 		return $this->inventory;
 	}
 
diff --git a/src/block/tile/BrewingStand.php b/src/block/tile/BrewingStand.php
index a75b4d9f1..f5248b611 100644
--- a/src/block/tile/BrewingStand.php
+++ b/src/block/tile/BrewingStand.php
@@ -112,17 +112,11 @@ class BrewingStand extends Spawnable implements Container, Nameable{
 		}
 	}
 
-	/**
-	 * @return BrewingStandInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : BrewingStandInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return BrewingStandInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : BrewingStandInventory{
 		return $this->inventory;
 	}
 
diff --git a/src/block/tile/Chest.php b/src/block/tile/Chest.php
index 6f68d4e71..d264e107d 100644
--- a/src/block/tile/Chest.php
+++ b/src/block/tile/Chest.php
@@ -114,20 +114,14 @@ class Chest extends Spawnable implements Container, Nameable{
 		$this->containerTraitBlockDestroyedHook();
 	}
 
-	/**
-	 * @return ChestInventory|DoubleChestInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : ChestInventory|DoubleChestInventory{
 		if($this->isPaired() && $this->doubleInventory === null){
 			$this->checkPairing();
 		}
 		return $this->doubleInventory instanceof DoubleChestInventory ? $this->doubleInventory : $this->inventory;
 	}
 
-	/**
-	 * @return ChestInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : ChestInventory{
 		return $this->inventory;
 	}
 
diff --git a/src/block/tile/Container.php b/src/block/tile/Container.php
index b549ad137..267b92a8d 100644
--- a/src/block/tile/Container.php
+++ b/src/block/tile/Container.php
@@ -30,10 +30,7 @@ interface Container extends InventoryHolder{
 	public const TAG_ITEMS = "Items";
 	public const TAG_LOCK = "Lock";
 
-	/**
-	 * @return Inventory
-	 */
-	public function getRealInventory();
+	public function getRealInventory() : Inventory;
 
 	/**
 	 * Returns whether this container can be opened by an item with the given custom name.
diff --git a/src/block/tile/ContainerTrait.php b/src/block/tile/ContainerTrait.php
index ba8ab084a..49130d053 100644
--- a/src/block/tile/ContainerTrait.php
+++ b/src/block/tile/ContainerTrait.php
@@ -38,10 +38,7 @@ trait ContainerTrait{
 	/** @var string|null */
 	private $lock = null;
 
-	/**
-	 * @return Inventory
-	 */
-	abstract public function getRealInventory();
+	abstract public function getRealInventory() : Inventory;
 
 	protected function loadItems(CompoundTag $tag) : void{
 		if(($inventoryTag = $tag->getTag(Container::TAG_ITEMS)) instanceof ListTag && $inventoryTag->getTagType() === NBT::TAG_Compound){
diff --git a/src/block/tile/Furnace.php b/src/block/tile/Furnace.php
index 389e367b8..7252fa45e 100644
--- a/src/block/tile/Furnace.php
+++ b/src/block/tile/Furnace.php
@@ -104,17 +104,11 @@ abstract class Furnace extends Spawnable implements Container, Nameable{
 		}
 	}
 
-	/**
-	 * @return FurnaceInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : FurnaceInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return FurnaceInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : FurnaceInventory{
 		return $this->getInventory();
 	}
 
diff --git a/src/block/tile/Hopper.php b/src/block/tile/Hopper.php
index c5fe6f167..89fb3cc4d 100644
--- a/src/block/tile/Hopper.php
+++ b/src/block/tile/Hopper.php
@@ -69,17 +69,11 @@ class Hopper extends Spawnable implements Container, Nameable{
 		return "Hopper";
 	}
 
-	/**
-	 * @return HopperInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : HopperInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return HopperInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : HopperInventory{
 		return $this->inventory;
 	}
 }
diff --git a/src/block/tile/ShulkerBox.php b/src/block/tile/ShulkerBox.php
index a649875a9..845963c60 100644
--- a/src/block/tile/ShulkerBox.php
+++ b/src/block/tile/ShulkerBox.php
@@ -93,17 +93,11 @@ class ShulkerBox extends Spawnable implements Container, Nameable{
 		$this->facing = $facing;
 	}
 
-	/**
-	 * @return ShulkerBoxInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : ShulkerBoxInventory{
 		return $this->inventory;
 	}
 
-	/**
-	 * @return ShulkerBoxInventory
-	 */
-	public function getRealInventory(){
+	public function getRealInventory() : ShulkerBoxInventory{
 		return $this->inventory;
 	}
 
diff --git a/src/command/defaults/ParticleCommand.php b/src/command/defaults/ParticleCommand.php
index 072ca9dc8..9abe965ff 100644
--- a/src/command/defaults/ParticleCommand.php
+++ b/src/command/defaults/ParticleCommand.php
@@ -23,11 +23,11 @@ declare(strict_types=1);
 
 namespace pocketmine\command\defaults;
 
-use pocketmine\block\BlockFactory;
+use pocketmine\block\BlockLegacyIds;
 use pocketmine\color\Color;
 use pocketmine\command\CommandSender;
 use pocketmine\command\utils\InvalidCommandSyntaxException;
-use pocketmine\item\ItemFactory;
+use pocketmine\item\StringToItemParser;
 use pocketmine\item\VanillaItems;
 use pocketmine\lang\KnownTranslationFactory;
 use pocketmine\math\Vector3;
@@ -70,7 +70,6 @@ use function explode;
 use function max;
 use function microtime;
 use function mt_rand;
-use function strpos;
 use function strtolower;
 
 class ParticleCommand extends VanillaCommand{
@@ -114,7 +113,7 @@ class ParticleCommand extends VanillaCommand{
 
 		$count = isset($args[7]) ? max(1, (int) $args[7]) : 1;
 
-		$data = isset($args[8]) ? (int) $args[8] : null;
+		$data = $args[8] ?? null;
 
 		$particle = $this->getParticle($name, $data);
 
@@ -138,7 +137,7 @@ class ParticleCommand extends VanillaCommand{
 		return true;
 	}
 
-	private function getParticle(string $name, ?int $data = null) : ?Particle{
+	private function getParticle(string $name, ?string $data = null) : ?Particle{
 		switch($name){
 			case "explode":
 				return new ExplodeParticle();
@@ -156,7 +155,7 @@ class ParticleCommand extends VanillaCommand{
 			case "crit":
 				return new CriticalParticle();
 			case "smoke":
-				return new SmokeParticle($data ?? 0);
+				return new SmokeParticle((int) ($data ?? 0));
 			case "spell":
 				return new EnchantParticle(new Color(0, 0, 0, 255)); //TODO: colour support
 			case "instantspell":
@@ -175,25 +174,31 @@ class ParticleCommand extends VanillaCommand{
 			case "lava":
 				return new LavaParticle();
 			case "reddust":
-				return new RedstoneParticle($data ?? 1);
+				return new RedstoneParticle((int) ($data ?? 1));
 			case "snowballpoof":
 				return new ItemBreakParticle(VanillaItems::SNOWBALL());
 			case "slime":
 				return new ItemBreakParticle(VanillaItems::SLIMEBALL());
 			case "itembreak":
-				if($data !== null && $data !== 0){
-					return new ItemBreakParticle(ItemFactory::getInstance()->get($data));
+				if($data !== null){
+					$item = StringToItemParser::getInstance()->parse($data);
+					if($item !== null && !$item->isNull()){
+						return new ItemBreakParticle($item);
+					}
 				}
 				break;
 			case "terrain":
-				if($data !== null && $data !== 0){
-					return new TerrainParticle(BlockFactory::getInstance()->get($data, 0));
+				if($data !== null){
+					$block = StringToItemParser::getInstance()->parse($data)?->getBlock();
+					if($block !== null && $block->getId() !== BlockLegacyIds::AIR){
+						return new TerrainParticle($block);
+					}
 				}
 				break;
 			case "heart":
-				return new HeartParticle($data ?? 0);
+				return new HeartParticle((int) ($data ?? 0));
 			case "ink":
-				return new InkParticle($data ?? 0);
+				return new InkParticle((int) ($data ?? 0));
 			case "droplet":
 				return new RainSplashParticle();
 			case "enchantmenttable":
@@ -203,26 +208,32 @@ class ParticleCommand extends VanillaCommand{
 			case "angryvillager":
 				return new AngryVillagerParticle();
 			case "forcefield":
-				return new BlockForceFieldParticle($data ?? 0);
+				return new BlockForceFieldParticle((int) ($data ?? 0));
 			case "mobflame":
 				return new EntityFlameParticle();
-		}
-
-		if(strpos($name, "iconcrack_") === 0){
-			$d = explode("_", $name);
-			if(count($d) === 3){
-				return new ItemBreakParticle(ItemFactory::getInstance()->get((int) $d[1], (int) $d[2]));
-			}
-		}elseif(strpos($name, "blockcrack_") === 0){
-			$d = explode("_", $name);
-			if(count($d) === 2){
-				return new TerrainParticle(BlockFactory::getInstance()->get(((int) $d[1]) & 0xff, ((int) $d[1]) >> 12));
-			}
-		}elseif(strpos($name, "blockdust_") === 0){
-			$d = explode("_", $name);
-			if(count($d) >= 4){
-				return new DustParticle(new Color(((int) $d[1]) & 0xff, ((int) $d[2]) & 0xff, ((int) $d[3]) & 0xff, isset($d[4]) ? ((int) $d[4]) & 0xff : 255));
-			}
+			case "iconcrack":
+				if($data !== null && ($item = StringToItemParser::getInstance()->parse($data)) !== null && !$item->isNull()){
+					return new ItemBreakParticle($item);
+				}
+				break;
+			case "blockcrack":
+				if($data !== null && ($block = StringToItemParser::getInstance()->parse($data)?->getBlock()) !== null && $block->getId() !== BlockLegacyIds::AIR){
+					return new TerrainParticle($block);
+				}
+				break;
+			case "blockdust":
+				if($data !== null){
+					$d = explode("_", $data);
+					if(count($d) >= 3){
+						return new DustParticle(new Color(
+							((int) $d[0]) & 0xff,
+							((int) $d[1]) & 0xff,
+							((int) $d[2]) & 0xff,
+							((int) ($d[3] ?? 255)) & 0xff
+						));
+					}
+				}
+				break;
 		}
 
 		return null;
diff --git a/src/entity/Human.php b/src/entity/Human.php
index a486c9d99..3d9cdf77f 100644
--- a/src/entity/Human.php
+++ b/src/entity/Human.php
@@ -189,10 +189,7 @@ class Human extends Living implements ProjectileSource, InventoryHolder{
 		return min(100, 7 * $this->xpManager->getXpLevel());
 	}
 
-	/**
-	 * @return PlayerInventory
-	 */
-	public function getInventory(){
+	public function getInventory() : PlayerInventory{
 		return $this->inventory;
 	}
 
diff --git a/src/inventory/InventoryHolder.php b/src/inventory/InventoryHolder.php
index ef8f0ee3e..f1c381f1b 100644
--- a/src/inventory/InventoryHolder.php
+++ b/src/inventory/InventoryHolder.php
@@ -25,10 +25,5 @@ namespace pocketmine\inventory;
 
 interface InventoryHolder{
 
-	/**
-	 * Get the object related inventory
-	 *
-	 * @return Inventory
-	 */
-	public function getInventory();
+	public function getInventory() : Inventory;
 }