diff --git a/Game/Entity/Entity.h b/Game/Entity/Entity.h
new file mode 100644
index 0000000..30ff11f
--- /dev/null
+++ b/Game/Entity/Entity.h
@@ -0,0 +1,70 @@
+#pragma once
+
+#include <concepts>
+#include <Core/Common/CoreUtils.h>
+#include <Core/Memory/Allocator.h>
+#include <Engine/Class.h>
+#include <Entity/EntityManager.h>
+#include <type_traits>
+
+// Add any new fields into the concept below
+#define DECLARE_ENTITY(entity)                                                                                         \
+    Entity*                     Base;                                                                                  \
+    static const Juliet::Class* Kind;
+
+// Will register the class globally at launch
+#define DEFINE_ENTITY(entity)                                                                                          \
+    constexpr Juliet::Class entityKind##entity(#entity, sizeof(#entity) / sizeof(char));                               \
+    const Juliet::Class*    entity::Kind = &entityKind##entity;
+
+namespace Game
+{
+    using DerivedType = void*;
+
+    struct Entity final
+    {
+        EntityID             ID;
+        const Juliet::Class* Kind;
+        DerivedType          Derived;
+        float                X, Y;
+    };
+
+    template <typename EntityType>
+    concept EntityConcept = requires(EntityType entity)
+    {
+        requires std::same_as<decltype(entity.Kind), const Juliet::Class*>;
+        requires std::same_as<decltype(entity.Base), Entity*>;
+    };
+
+    template <typename EntityType>
+        requires EntityConcept<EntityType>
+    bool IsA(const Entity* entity)
+    {
+        return entity->Kind == EntityType::Kind;
+    }
+
+    template <typename EntityType>
+        requires EntityConcept<EntityType>
+    EntityType* MakeEntity(EntityManager& manager, float x, float y)
+    {
+        EntityType* result = static_cast<EntityType*>(Juliet::Calloc(1, sizeof(EntityType)));
+        Entity*     base = result->Base = static_cast<Entity*>(Juliet::Calloc(1, sizeof(Entity)));
+        base->X                         = x;
+        base->Y                         = y;
+        base->Derived                   = result;
+        base->Kind                      = EntityType::Kind;
+
+        RegisterEntity(manager, base);
+
+        return result;
+    }
+
+    template <typename EntityType>
+        requires EntityConcept<EntityType>
+    EntityType* DownCast(Entity* entity)
+    {
+        Assert(IsA<EntityType>(entity));
+        return static_cast<EntityType*>(entity->Derived);
+    }
+
+} // namespace Game
diff --git a/Game/Entity/EntityManager.cpp b/Game/Entity/EntityManager.cpp
new file mode 100644
index 0000000..e41b908
--- /dev/null
+++ b/Game/Entity/EntityManager.cpp
@@ -0,0 +1,25 @@
+#include <Entity/EntityManager.h>
+
+#include <Entity/Entity.h>
+
+namespace Game
+{
+    namespace
+    {
+        EntityManager Manager;
+    }
+
+    EntityID EntityManager::ID = 0;
+
+    void InitEntityManager() {}
+
+    EntityManager& GetEntityManager()
+    {
+        return Manager;
+    }
+
+    void RegisterEntity(EntityManager& manager, Entity* entity)
+    {
+        entity->ID = EntityManager::ID++;
+    }
+} // namespace Game
diff --git a/Game/Entity/EntityManager.h b/Game/Entity/EntityManager.h
new file mode 100644
index 0000000..10455ef
--- /dev/null
+++ b/Game/Entity/EntityManager.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <Core/Common/CoreTypes.h>
+
+namespace Game
+{
+    using EntityID = uint64_t;
+
+    struct Entity;
+    struct EntityManager
+    {
+        static EntityID ID;
+        // May be this should contains the allocator for each entity types
+    };
+
+    void InitEntityManager();\
+    EntityManager& GetEntityManager();
+    void RegisterEntity(EntityManager& manager, Entity* entity);
+}
diff --git a/Juliet.sln b/Juliet.sln
index 1686529..00d6d7b 100644
--- a/Juliet.sln
+++ b/Juliet.sln
@@ -10,6 +10,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "JulietApp", "JulietApp\Juli
 		{1BBC0B92-E4D8-4838-974B-439C5C501E82} = {1BBC0B92-E4D8-4838-974B-439C5C501E82}
 	EndProjectSection
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Game", "Game\Game.vcxproj", "{B7B12DCC-1A69-4371-A9FE-D6E7671497B0}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -24,6 +26,10 @@ Global
 		{4B2A0F9C-5F78-4BC9-BEE9-1E58BB85FA79}.Debug|x64.Build.0 = Debug|x64
 		{4B2A0F9C-5F78-4BC9-BEE9-1E58BB85FA79}.Release|x64.ActiveCfg = Release|x64
 		{4B2A0F9C-5F78-4BC9-BEE9-1E58BB85FA79}.Release|x64.Build.0 = Release|x64
+		{B7B12DCC-1A69-4371-A9FE-D6E7671497B0}.Debug|x64.ActiveCfg = Debug|x64
+		{B7B12DCC-1A69-4371-A9FE-D6E7671497B0}.Debug|x64.Build.0 = Debug|x64
+		{B7B12DCC-1A69-4371-A9FE-D6E7671497B0}.Release|x64.ActiveCfg = Release|x64
+		{B7B12DCC-1A69-4371-A9FE-D6E7671497B0}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/Juliet/Juliet.vcxproj b/Juliet/Juliet.vcxproj
index 7279447..a018e53 100644
--- a/Juliet/Juliet.vcxproj
+++ b/Juliet/Juliet.vcxproj
@@ -15,7 +15,7 @@
     <Keyword>Win32Proj</Keyword>
     <ProjectGuid>{1bbc0b92-e4d8-4838-974b-439c5c501e82}</ProjectGuid>
     <RootNamespace>Juliet</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0.26100.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
@@ -106,6 +106,7 @@
     <ClInclude Include="include\Core\Application\IApplication.h" />
     <ClInclude Include="include\Core\Common\CoreTypes.h" />
     <ClInclude Include="include\Core\Common\CoreUtils.h" />
+    <ClInclude Include="include\Core\Common\CRC32.h" />
     <ClInclude Include="include\Core\Common\EnumUtils.h" />
     <ClInclude Include="include\Core\Common\NonCopyable.h" />
     <ClInclude Include="include\Core\Common\NonMovable.h" />
@@ -131,6 +132,7 @@
     <ClInclude Include="include\Core\Networking\TcpListener.h" />
     <ClInclude Include="include\Core\Networking\TcpSocket.h" />
     <ClInclude Include="include\Core\Thread\Thread.h" />
+    <ClInclude Include="include\Engine\Class.h" />
     <ClInclude Include="include\Engine\Engine.h" />
     <ClInclude Include="include\Graphics\Graphics.h" />
     <ClInclude Include="include\Graphics\GraphicsConfig.h" />
@@ -149,6 +151,7 @@
     <ClInclude Include="src\Core\HAL\Event\WindowEvent.h" />
     <ClInclude Include="src\Core\Networking\SocketPlatformImpl.h" />
     <ClInclude Include="src\Core\HAL\Win32.h" />
+    <ClInclude Include="src\Graphics\D3D12\DX12CommandBuffer.h" />
     <ClInclude Include="src\Graphics\D3D12\DX12Includes.h" />
     <ClInclude Include="src\Graphics\D3D12\DX12Utils.h" />
     <ClInclude Include="src\Graphics\GraphicsDevice.h" />
@@ -228,6 +231,7 @@
     <ClCompile Include="src\Core\Networking\TcpSocket.cpp" />
     <ClCompile Include="src\Core\Networking\Win32\Win32SocketPlatformImpl.cpp" />
     <ClCompile Include="src\Engine\Engine.cpp" />
+    <ClCompile Include="src\Graphics\D3D12\DX12CommandBuffer.cpp" />
     <ClCompile Include="src\Graphics\D3D12\DX12GraphicsDevice.cpp" />
     <ClCompile Include="src\Graphics\Graphics.cpp">
       <RuntimeLibrary>MultiThreadedDebugDll</RuntimeLibrary>
diff --git a/Juliet/include/Core/Common/CRC32.h b/Juliet/include/Core/Common/CRC32.h
new file mode 100644
index 0000000..10d8588
--- /dev/null
+++ b/Juliet/include/Core/Common/CRC32.h
@@ -0,0 +1,58 @@
+#pragma once
+
+// From https://web.mit.edu/freebsd/head/sys/libkern/crc32.c
+
+namespace Juliet
+{
+    namespace details
+    {
+        constexpr uint32_t crc32_tab[] = {
+            0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832,
+            0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+            0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a,
+            0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+            0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
+            0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+            0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab,
+            0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+            0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4,
+            0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+            0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074,
+            0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+            0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525,
+            0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+            0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
+            0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+            0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76,
+            0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+            0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6,
+            0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+            0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7,
+            0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+            0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7,
+            0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+            0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
+            0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+            0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330,
+            0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+            0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+        };
+    }
+
+    consteval uint32 crc32(const char* str, size_t length)
+    {
+        const char* p   = str;
+        uint32_t       crc = ~0U;
+        while (length--)
+        {
+            crc = details::crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
+        }
+        return crc ^ ~0U;
+    }
+
+    consteval uint32 operator""_crc32(const char* str, size_t length)
+    {
+        return crc32(str, length);
+    }
+
+} // namespace Juliet
diff --git a/Juliet/include/Core/Common/CoreTypes.h b/Juliet/include/Core/Common/CoreTypes.h
index a553826..e4a9e59 100644
--- a/Juliet/include/Core/Common/CoreTypes.h
+++ b/Juliet/include/Core/Common/CoreTypes.h
@@ -3,27 +3,24 @@
 #include <cstddef>
 #include <cstdint>
 
-namespace Juliet
+using uint8  = uint8_t;
+using uint16 = uint16_t;
+using uint32 = uint32_t;
+using uint64 = uint64_t;
+
+using int8  = int8_t;
+using int16 = int16_t;
+using int32 = int32_t;
+using int64 = int64_t;
+
+using Byte = std::byte;
+
+using size_t = std::size_t;
+
+struct ByteBuffer
 {
-    using uint8  = uint8_t;
-    using uint16 = uint16_t;
-    using uint32 = uint32_t;
-    using uint64 = uint64_t;
+    const Byte* Data;
+    size_t      Size;
+};
 
-    using int8  = int8_t;
-    using int16 = int16_t;
-    using int32 = int32_t;
-    using int64 = int64_t;
-
-    using byte = std::byte;
-
-    using size_t = std::size_t;
-
-    struct ByteBuffer
-    {
-        const byte* Data;
-        size_t      Size;
-    };
-
-    using FunctionPtr = auto (*)(void) -> void;
-} // namespace Juliet
+using FunctionPtr = auto (*)(void) -> void;
diff --git a/Juliet/include/Core/Common/CoreUtils.h b/Juliet/include/Core/Common/CoreUtils.h
index 825d249..97e3262 100644
--- a/Juliet/include/Core/Common/CoreUtils.h
+++ b/Juliet/include/Core/Common/CoreUtils.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <Juliet.h>
+#include <Core/Common/CoreTypes.h>
 
 namespace Juliet
 {
diff --git a/Juliet/include/Core/Memory/Allocator.h b/Juliet/include/Core/Memory/Allocator.h
index 13d9b7f..94ce63f 100644
--- a/Juliet/include/Core/Memory/Allocator.h
+++ b/Juliet/include/Core/Memory/Allocator.h
@@ -5,10 +5,10 @@
 namespace Juliet
 {
     // Uninitialized allocation
-    void* Malloc(size_t nb_elem, size_t elem_size);
+    JULIET_API void* Malloc(size_t nb_elem, size_t elem_size);
     // Initialized to 0 allocation
-    void* Calloc(size_t nb_elem, size_t elem_size);
-    void* Realloc(void* memory, size_t newSize);
+    JULIET_API void* Calloc(size_t nb_elem, size_t elem_size);
+    JULIET_API void* Realloc(void* memory, size_t newSize);
 
     // Free
     template <typename Type>
diff --git a/Juliet/include/Core/Networking/NetworkPacket.h b/Juliet/include/Core/Networking/NetworkPacket.h
index 2e72034..f121878 100644
--- a/Juliet/include/Core/Networking/NetworkPacket.h
+++ b/Juliet/include/Core/Networking/NetworkPacket.h
@@ -29,7 +29,7 @@ namespace Juliet
         friend class TcpSocket;
 
       private:
-        Vector<byte> Data;
+        Vector<Byte> Data;
         size_t       PartialSendIndex = 0;
     };
 } // namespace Juliet
diff --git a/Juliet/include/Engine/Class.h b/Juliet/include/Engine/Class.h
new file mode 100644
index 0000000..84c1b37
--- /dev/null
+++ b/Juliet/include/Engine/Class.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <Core/Common/CRC32.h>
+#include <Juliet.h>
+
+namespace Juliet
+{
+    struct Class
+    {
+        uint32 CRC;
+#if JULIET_DEBUG
+        // TODO: string struct may be
+        const char* Name;
+        size_t      Name_Length;
+#endif
+
+        consteval Class(const char* className, size_t name_length)
+        {
+            CRC = crc32(className, name_length);
+#if JULIET_DEBUG
+            // TODO: string struct may be
+            Name = className;
+            Name_Length = name_length;
+#endif
+        }
+    };
+
+    template <typename type>
+    bool IsA(Class& cls)
+    {
+        return cls.CRC == type::StaticClass->CRC;
+    }
+} // namespace Juliet
diff --git a/Juliet/include/Juliet.h b/Juliet/include/Juliet.h
index a4c61c2..6efdf5f 100644
--- a/Juliet/include/Juliet.h
+++ b/Juliet/include/Juliet.h
@@ -18,4 +18,8 @@
 #   define JULIET_API (void) // Only Win32 is supported for now
 # endif
 #endif
+
+#if _DEBUG
+#define JULIET_DEBUG 1
+#endif
 // clang-format on
diff --git a/Juliet/src/Core/Networking/NetworkPacket.cpp b/Juliet/src/Core/Networking/NetworkPacket.cpp
index 19a925f..7bac2f3 100644
--- a/Juliet/src/Core/Networking/NetworkPacket.cpp
+++ b/Juliet/src/Core/Networking/NetworkPacket.cpp
@@ -3,7 +3,7 @@
 #include <Core/Networking/NetworkPacket.h>
 #include <Core/Networking/SocketPlatformImpl.h>
 
-#define TO_BUFFER(ptr) reinterpret_cast<const byte*>(ptr)
+#define TO_BUFFER(ptr) reinterpret_cast<const Byte*>(ptr)
 
 namespace Juliet
 {
diff --git a/Juliet/src/Core/Networking/TcpSocket.cpp b/Juliet/src/Core/Networking/TcpSocket.cpp
index ca3b91b..7e84adf 100644
--- a/Juliet/src/Core/Networking/TcpSocket.cpp
+++ b/Juliet/src/Core/Networking/TcpSocket.cpp
@@ -26,7 +26,7 @@ namespace Juliet
         // Because of that we will send the size of the packet first before sending the data.
 
         // TODO Use scratch allocator.
-        Vector<byte> scratchVector;
+        Vector<Byte> scratchVector;
         scratchVector.resize(buffer.Size + sizeof(uint32));
 
         // htonl converts uint32 from host byte order to network byte order
diff --git a/JulietApp/Editor/EditorMain_win32.cpp b/JulietApp/Editor/EditorMain_win32.cpp
index 08c3d0f..98558a0 100644
--- a/JulietApp/Editor/EditorMain_win32.cpp
+++ b/JulietApp/Editor/EditorMain_win32.cpp
@@ -11,6 +11,7 @@
 #include <cstdlib>
 
 // TODO : Replace with message box from framework + call main and not winmain + subsystem
+#include <Core/DynLib/DynamicLibrary.h>
 #include <Graphics/Graphics.h>
 #include <Windows.h>
 
@@ -33,12 +34,16 @@ void Win32EditorApplication::Init()
     // TODO : Assign the graphics device to the main window (and detach)
 
     Running = MainWindow != nullptr && GraphicsDevice != nullptr;
+
+    DynamicLibrary = LoadDynamicLibrary("Game.dll");
 }
 
 void Win32EditorApplication::Shutdown()
 {
     Log(LogLevel::Message, LogCategory::Editor, "Shutdown Editor Application...");
 
+    UnloadDynamicLibrary(DynamicLibrary);
+
     if (MainWindow)
     {
         DestroyPlatformWindow(MainWindow);
@@ -65,9 +70,7 @@ void Win32EditorApplication::Update()
     }
 
     // Draw here for now
-// 1) Acquire a Command Buffer
-
-
+    // 1) Acquire a Command Buffer
 }
 
 bool Win32EditorApplication::IsRunning()
diff --git a/JulietApp/Editor/EditorMain_win32.h b/JulietApp/Editor/EditorMain_win32.h
index 739647e..86c8d9a 100644
--- a/JulietApp/Editor/EditorMain_win32.h
+++ b/JulietApp/Editor/EditorMain_win32.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <Core/Application/IApplication.h>
+#include <Core/DynLib/DynamicLibrary.h>
 #include <Core/HAL/Display/Display.h>
 
 namespace Juliet
@@ -20,6 +21,7 @@ class Win32EditorApplication : public Juliet::IApplication
   private:
     Juliet::Window* MainWindow = {};
     Juliet::GraphicsDevice* GraphicsDevice = {};
+    Juliet::DynamicLibrary* DynamicLibrary = {};
 
     bool            Running    = false;
 };