diff --git a/Source/Framework/Realm/RealmManager.cs b/Source/Framework/Realm/RealmManager.cs
index 037275570..9ae3bc1de 100644
--- a/Source/Framework/Realm/RealmManager.cs
+++ b/Source/Framework/Realm/RealmManager.cs
@@ -35,11 +35,44 @@ public class RealmManager : Singleton<RealmManager>
         _updateTimer = new Timer(TimeSpan.FromSeconds(updateInterval).TotalMilliseconds);
         _updateTimer.Elapsed += UpdateRealms;
 
+        LoadBuildInfo();
+
         UpdateRealms(null, null);
 
         _updateTimer.Start();
     }
 
+    void LoadBuildInfo()
+    {
+        //                                         0             1             2              3              4      5              6
+        SQLResult result = DB.Login.Query("SELECT majorVersion, minorVersion, bugfixVersion, hotfixVersion, build, win64AuthSeed, mac64AuthSeed FROM build_info ORDER BY build ASC");
+        if (!result.IsEmpty())
+        {
+            do
+            {
+                RealmBuildInfo build = new RealmBuildInfo();
+                build.MajorVersion = result.Read<uint>(0);
+                build.MinorVersion = result.Read<uint>(1);
+                build.BugfixVersion = result.Read<uint>(2);
+                string hotfixVersion = result.Read<string>(3);
+                if (hotfixVersion.Length < build.HotfixVersion.Length)
+                    build.HotfixVersion = hotfixVersion.ToCharArray();
+
+                build.Build = result.Read<uint>(4);
+                string win64AuthSeedHexStr = result.Read<string>(5);
+                if (win64AuthSeedHexStr.Length == build.Win64AuthSeed.Length * 2)
+                    build.Win64AuthSeed = win64AuthSeedHexStr.ToByteArray();
+
+                string mac64AuthSeedHexStr = result.Read<string>(6);
+                if (mac64AuthSeedHexStr.Length == build.Mac64AuthSeed.Length * 2)
+                    build.Mac64AuthSeed = mac64AuthSeedHexStr.ToByteArray();
+
+                _builds.Add(build);
+
+            } while (result.NextRow());
+        }
+    }
+
     public void Close()
     {
         _updateTimer.Close();
@@ -119,37 +152,9 @@ public class RealmManager : Singleton<RealmManager>
         return _realms.LookupByKey(id);
     }
 
-    // List of client builds for verbose version info in realmlist packet
-    RealmBuildInfo[] ClientBuilds =
+    public RealmBuildInfo GetBuildInfo(uint build)
     {
-        new RealmBuildInfo(32722, 8, 2, 5, ' ' ),
-        new RealmBuildInfo(32638, 8, 2, 5, ' ' ),
-        new RealmBuildInfo(32580, 8, 2, 5, ' ' ),
-        new RealmBuildInfo(32494, 8, 2, 5, ' ' ),
-        new RealmBuildInfo(28938, 8, 1, 5, ' ' ),
-        new RealmBuildInfo(21355, 6, 2, 4, ' ' ),
-        new RealmBuildInfo(20726, 6, 2, 3, ' ' ),
-        new RealmBuildInfo(20574, 6, 2, 2, 'a' ),
-        new RealmBuildInfo(20490, 6, 2, 2, 'a' ),
-        new RealmBuildInfo(15595, 4, 3, 4, ' ' ),
-        new RealmBuildInfo(14545, 4, 2, 2, ' ' ),
-        new RealmBuildInfo(13623, 4, 0, 6, 'a' ),
-        new RealmBuildInfo(13930, 3, 3, 5, 'a' ),                                  // 3.3.5a China Mainland build
-        new RealmBuildInfo(12340, 3, 3, 5, 'a' ),
-        new RealmBuildInfo(11723, 3, 3, 3, 'a' ),
-        new RealmBuildInfo(11403, 3, 3, 2, ' ' ),
-        new RealmBuildInfo(11159, 3, 3, 0, 'a' ),
-        new RealmBuildInfo(10505, 3, 2, 2, 'a' ),
-        new RealmBuildInfo(9947,  3, 1, 3, ' ' ),
-        new RealmBuildInfo(8606,  2, 4, 3, ' ' ),
-        new RealmBuildInfo(6141,  1, 12, 3, ' ' ),
-        new RealmBuildInfo(6005,  1, 12, 2, ' ' ),
-        new RealmBuildInfo(5875,  1, 12, 1, ' ' ),
-    };
-
-    RealmBuildInfo GetBuildInfo(uint build)
-    {
-        foreach (var clientBuild in ClientBuilds)
+        foreach (var clientBuild in _builds)
             if (clientBuild.Build == build)
                 return clientBuild;
 
@@ -158,11 +163,7 @@ public class RealmManager : Singleton<RealmManager>
 
     public uint GetMinorMajorBugfixVersionForBuild(uint build)
     {
-        RealmBuildInfo buildInfo = ClientBuilds.FirstOrDefault(p =>
-        {
-            return p.Build < build;
-        });
-
+        RealmBuildInfo buildInfo = _builds.FirstOrDefault(p => p.Build < build);
         return buildInfo != null ? (buildInfo.MajorVersion * 10000 + buildInfo.MinorVersion * 100 + buildInfo.BugfixVersion) : 0;
     }
 
@@ -326,25 +327,19 @@ public class RealmManager : Singleton<RealmManager>
     public ICollection<Realm> GetRealms() { return _realms.Values; }
     List<string> GetSubRegions() { return _subRegions; }
 
+    List<RealmBuildInfo> _builds = new List<RealmBuildInfo>();
     ConcurrentDictionary<RealmHandle, Realm> _realms = new ConcurrentDictionary<RealmHandle, Realm>();
     List<string> _subRegions = new List<string>();
     Timer _updateTimer;
 }
 
-class RealmBuildInfo
+public class RealmBuildInfo
 {
-    public RealmBuildInfo(uint build, uint majorVersion, uint minorVersion, uint bugfixVersion, char hotfixVersion = ' ')
-    {
-        Build = build;
-        MajorVersion = majorVersion;
-        MinorVersion = minorVersion;
-        BugfixVersion = bugfixVersion;
-        HotfixVersion = hotfixVersion;
-    }
-
     public uint Build;
     public uint MajorVersion;
     public uint MinorVersion;
     public uint BugfixVersion;
-    public char HotfixVersion;
+    public char[] HotfixVersion = new char[4];
+    public byte[] Win64AuthSeed = new byte[16];
+    public byte[] Mac64AuthSeed = new byte[16];
 }
diff --git a/Source/Game/Network/WorldSocket.cs b/Source/Game/Network/WorldSocket.cs
index acdb07e83..940eb2679 100644
--- a/Source/Game/Network/WorldSocket.cs
+++ b/Source/Game/Network/WorldSocket.cs
@@ -37,9 +37,6 @@ namespace Game.Network
         static byte[] ContinuedSessionSeed = { 0x16, 0xAD, 0x0C, 0xD4, 0x46, 0xF9, 0x4F, 0xB2, 0xEF, 0x7D, 0xEA, 0x2A, 0x17, 0x66, 0x4D, 0x2F };
         static byte[] EncryptionKeySeed = { 0xE9, 0x75, 0x3C, 0x50, 0x90, 0x93, 0x61, 0xDA, 0x3B, 0x07, 0xEE, 0xFA, 0xFF, 0x9D, 0x41, 0xB8 };
 
-        static byte[] ClientTypeSeed_Wn64 = { 0x1A, 0x09, 0xBE, 0x1D, 0x38, 0xA1, 0x22, 0x58, 0x6B, 0x49, 0x31, 0xBE, 0xCC, 0xEA, 0xD4, 0xAA };
-        static byte[] ClientTypeSeed_Mc64 = { 0x34, 0x1C, 0xFE, 0xFE, 0x3D, 0x72, 0xAC, 0xA9, 0xA4, 0x40, 0x7D, 0xC5, 0x35, 0xDE, 0xD6, 0x6A };
-
         public WorldSocket(Socket socket) : base(socket)
         {
             _connectType = ConnectionType.Realm;
@@ -394,6 +391,15 @@ namespace Game.Network
                 return;
             }
 
+            RealmBuildInfo buildInfo = Global.RealmMgr.GetBuildInfo(Global.WorldMgr.GetRealm().Build);
+            if (buildInfo == null)
+            {
+                SendAuthResponseError(BattlenetRpcErrorCode.BadVersion);
+                Log.outError(LogFilter.Network, $"WorldSocket.HandleAuthSessionCallback: Missing auth seed for realm build {Global.WorldMgr.GetRealm().Build} ({GetRemoteIpAddress().ToString()}).");
+                CloseSocket();
+                return;
+            }
+
             AccountInfo account = new AccountInfo(result.GetFields());
 
             // For hook purposes, we get Remoteaddress at this point.
@@ -402,9 +408,9 @@ namespace Game.Network
             Sha256 digestKeyHash = new Sha256();
             digestKeyHash.Process(account.game.SessionKey, account.game.SessionKey.Length);
             if (account.game.OS == "Wn64")
-                digestKeyHash.Finish(ClientTypeSeed_Wn64);
+                digestKeyHash.Finish(buildInfo.Win64AuthSeed);
             else if (account.game.OS == "Mc64")
-                digestKeyHash.Finish(ClientTypeSeed_Mc64);
+                digestKeyHash.Finish(buildInfo.Mac64AuthSeed);
             else
             {
                 Log.outError(LogFilter.Network, "WorldSocket.HandleAuthSession: Authentication failed for account: {0} ('{1}') address: {2}", account.game.Id, authSession.RealmJoinTicket, address);
diff --git a/default.props b/default.props
index b33ce5dca..102eea6b1 100644
--- a/default.props
+++ b/default.props
@@ -29,9 +29,5 @@
     <IsMac Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::OSX)))' == 'true'">true</IsMac>
     <IsLinux Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::Linux)))' == 'true'">true</IsLinux>
   </PropertyGroup>
-  
-  <ItemGroup>
-    <PackageReference Include="System.Reflection.Emit.Lightweight" Version="4.3.0" />
-  </ItemGroup>
 
 </Project>
diff --git a/sql/base/auth_database.sql b/sql/base/auth_database.sql
index a14ca4383..4470e6fdd 100644
--- a/sql/base/auth_database.sql
+++ b/sql/base/auth_database.sql
@@ -435,6 +435,123 @@ LOCK TABLES `battlenet_item_favorite_appearances` WRITE;
 /*!40000 ALTER TABLE `battlenet_item_favorite_appearances` ENABLE KEYS */;
 UNLOCK TABLES;
 
+--
+-- Table structure for table `build_info`
+--
+
+DROP TABLE IF EXISTS `build_info`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8mb4 */;
+CREATE TABLE `build_info` (
+  `build` int(11) NOT NULL,
+  `majorVersion` int(11) DEFAULT NULL,
+  `minorVersion` int(11) DEFAULT NULL,
+  `bugfixVersion` int(11) DEFAULT NULL,
+  `hotfixVersion` char(3) DEFAULT NULL,
+  `winAuthSeed` varchar(32) DEFAULT NULL,
+  `win64AuthSeed` varchar(32) DEFAULT NULL,
+  `mac64AuthSeed` varchar(32) DEFAULT NULL,
+  `winChecksumSeed` varchar(40) DEFAULT NULL,
+  `macChecksumSeed` varchar(40) DEFAULT NULL,
+  PRIMARY KEY (`build`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+--
+-- Dumping data for table `build_info`
+--
+
+LOCK TABLES `build_info` WRITE;
+/*!40000 ALTER TABLE `build_info` DISABLE KEYS */;
+INSERT INTO `build_info` VALUES
+(5875,1,12,1,NULL,NULL,NULL,NULL,'95EDB27C7823B363CBDDAB56A392E7CB73FCCA20','8D173CC381961EEBABF336F5E6675B101BB513E5'),
+(6005,1,12,2,NULL,NULL,NULL,NULL,NULL,NULL),
+(6141,1,12,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(8606,2,4,3,NULL,NULL,NULL,NULL,'319AFAA3F2559682F9FF658BE01456255F456FB1','D8B0ECFE534BC1131E19BAD1D4C0E813EEE4994F'),
+(9947,3,1,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(10505,3,2,2,'a',NULL,NULL,NULL,NULL,NULL),
+(11159,3,3,0,'a',NULL,NULL,NULL,NULL,NULL),
+(11403,3,3,2,NULL,NULL,NULL,NULL,NULL,NULL),
+(11723,3,3,3,'a',NULL,NULL,NULL,NULL,NULL),
+(12340,3,3,5,'a',NULL,NULL,NULL,'CDCBBD5188315E6B4D19449D492DBCFAF156A347','B706D13FF2F4018839729461E3F8A0E2B5FDC034'),
+(13623,4,0,6,'a',NULL,NULL,NULL,NULL,NULL),
+(13930,3,3,5,'a',NULL,NULL,NULL,NULL,NULL),
+(14545,4,2,2,NULL,NULL,NULL,NULL,NULL,NULL),
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+(19116,6,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(19243,6,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(19342,6,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(19702,6,1,0,NULL,NULL,NULL,NULL,NULL,NULL),
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+(19865,6,1,2,NULL,NULL,NULL,NULL,NULL,NULL),
+(20182,6,2,0,'a',NULL,NULL,NULL,NULL,NULL),
+(20201,6,2,0,NULL,NULL,NULL,NULL,NULL,NULL),
+(20216,6,2,0,NULL,NULL,NULL,NULL,NULL,NULL),
+(20253,6,2,0,NULL,NULL,NULL,NULL,NULL,NULL),
+(20338,6,2,0,NULL,NULL,NULL,NULL,NULL,NULL),
+(20444,6,2,2,NULL,NULL,NULL,NULL,NULL,NULL),
+(20490,6,2,2,'a',NULL,NULL,NULL,NULL,NULL),
+(20574,6,2,2,'a',NULL,NULL,NULL,NULL,NULL),
+(20726,6,2,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(20779,6,2,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(20886,6,2,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(21355,6,2,4,NULL,NULL,NULL,NULL,NULL,NULL),
+(21463,6,2,4,NULL,NULL,NULL,NULL,NULL,NULL),
+(21742,6,2,4,NULL,NULL,NULL,NULL,NULL,NULL),
+(22248,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(22293,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(22345,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(22410,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
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+(22498,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(22522,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(22566,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(22594,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
+(22624,7,0,3,NULL,NULL,NULL,NULL,NULL,NULL),
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+(25549,7,3,2,NULL,'FE594FC35E7F9AFF86D99D8A364AB297','1252624ED8CBD6FAC7D33F5D67A535F3','66FC5E09B8706126795F140308C8C1D8',NULL,NULL),
+(25996,7,3,5,NULL,'23C59C5963CBEF5B728D13A50878DFCB','C7FF932D6A2174A3D538CA7212136D2B','210B970149D6F56CAC9BADF2AAC91E8E',NULL,NULL),
+(26124,7,3,5,NULL,'F8C05AE372DECA1D6C81DA7A8D1C5C39','46DF06D0147BA67BA49AF553435E093F','C9CA997AB8EDE1C65465CB2920869C4E',NULL,NULL),
+(26365,7,3,5,NULL,'2AAC82C80E829E2CA902D70CFA1A833A','59A53F307288454B419B13E694DF503C','DBE7F860276D6B400AAA86B35D51A417',NULL,NULL),
+(26654,7,3,5,NULL,'FAC2D693E702B9EC9F750F17245696D8','A752640E8B99FE5B57C1320BC492895A','9234C1BD5E9687ADBD19F764F2E0E811',NULL,NULL),
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+(28153,8,0,1,NULL,NULL,'DD626517CC6D31932B479934CCDC0ABF',NULL,NULL,NULL),
+(30706,8,1,5,NULL,NULL,'BB6D9866FE4A19A568015198783003FC',NULL,NULL,NULL),
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+(31229,8,2,0,NULL,NULL,'8A46F23670309F2AAE85C9A47276382B',NULL,NULL,NULL),
+(31429,8,2,0,NULL,NULL,'7795A507AF9DC3525EFF724FEE17E70C',NULL,NULL,NULL),
+(31478,8,2,0,NULL,NULL,'7973A8D54BDB8B798D9297B096E771EF',NULL,NULL,NULL),
+(32305,8,2,5,NULL,NULL,'21F5A6FC7AD89FBF411FDA8B8738186A',NULL,NULL,NULL),
+(32494,8,2,5,NULL,NULL,'58984ACE04919401835C61309A848F8A',NULL,NULL,NULL),
+(32580,8,2,5,NULL,NULL,'87C2FAA0D7931BF016299025C0DDCA14',NULL,NULL,NULL),
+(32638,8,2,5,NULL,NULL,'5D07ECE7D4A867DDDE615DAD22B76D4E',NULL,NULL,NULL),
+(32722,8,2,5,NULL,NULL,'1A09BE1D38A122586B4931BECCEAD4AA',NULL,NULL,NULL),
+(32750,8,2,5,NULL,NULL,'C5CB669F5A5B237D1355430877173207',NULL,NULL,NULL);
+/*!40000 ALTER TABLE `build_info` ENABLE KEYS */;
+UNLOCK TABLES;
+
 --
 -- Table structure for table `ip_banned`
 --
@@ -2009,7 +2126,7 @@ CREATE TABLE `realmlist` (
   `timezone` tinyint(3) unsigned NOT NULL DEFAULT '0',
   `allowedSecurityLevel` tinyint(3) unsigned NOT NULL DEFAULT '0',
   `population` float unsigned NOT NULL DEFAULT '0',
-  `gamebuild` int(10) unsigned NOT NULL DEFAULT '32722',
+  `gamebuild` int(10) unsigned NOT NULL DEFAULT '32750',
   `Region` tinyint(3) unsigned NOT NULL DEFAULT '1',
   `Battlegroup` tinyint(3) unsigned NOT NULL DEFAULT '1',
   PRIMARY KEY (`id`),
@@ -2024,7 +2141,7 @@ CREATE TABLE `realmlist` (
 LOCK TABLES `realmlist` WRITE;
 /*!40000 ALTER TABLE `realmlist` DISABLE KEYS */;
 INSERT INTO `realmlist` VALUES
-(1,'Trinity','127.0.0.1','127.0.0.1','255.255.255.0',8085,0,0,1,0,0,32722,1,1);
+(1,'Trinity','127.0.0.1','127.0.0.1','255.255.255.0',8085,0,0,1,0,0,32750,1,1);
 /*!40000 ALTER TABLE `realmlist` ENABLE KEYS */;
 UNLOCK TABLES;
 
@@ -2192,7 +2309,9 @@ INSERT INTO `updates` VALUES
 ('2019_11_13_00_auth.sql','EB680BA7D6B3A21A432687F452CDD86FB2DA677C','RELEASED','2019-11-13 11:49:55',0),
 ('2019_11_20_00_auth.sql','9BC11595D9CEA486AC1540A204DCE9D86A008D7D','RELEASED','2019-11-20 12:31:56',0),
 ('2019_11_23_00_auth.sql','098708CDC5614B4523AD3B17670939671E661443','RELEASED','2019-11-23 12:20:03',0),
-('2019_12_04_00_auth.sql','4EB3D028DD80B18DA9B9250ADA4D22AA0D3C0447','RELEASED','2019-12-04 18:03:39',0);
+('2019_12_04_00_auth.sql','4EB3D028DD80B18DA9B9250ADA4D22AA0D3C0447','RELEASED','2019-12-04 18:03:39',0),
+('2019_12_07_00_auth.sql','F354DA31D5B300609C6AE8A25667CA4DE0A7349F','RELEASED','2019-12-07 12:57:23',0),
+('2019_12_10_00_auth.sql','CC0DC6211FB2A1271EBF5D81F47B3EF1CED7A7AD','RELEASED','2019-12-10 17:50:44',0);
 /*!40000 ALTER TABLE `updates` ENABLE KEYS */;
 UNLOCK TABLES;
 
diff --git a/sql/updates/auth/master/2019_12_07_00_auth.sql b/sql/updates/auth/master/2019_12_07_00_auth.sql
new file mode 100644
index 000000000..1cbe9f224
--- /dev/null
+++ b/sql/updates/auth/master/2019_12_07_00_auth.sql
@@ -0,0 +1,106 @@
+--
+-- Table structure for table `build_info`
+--
+DROP TABLE IF EXISTS `build_info`;
+CREATE TABLE `build_info` (
+  `build` int(11) NOT NULL,
+  `majorVersion` int(11) DEFAULT NULL,
+  `minorVersion` int(11) DEFAULT NULL,
+  `bugfixVersion` int(11) DEFAULT NULL,
+  `hotfixVersion` char(3) DEFAULT NULL,
+  `winAuthSeed` varchar(32) DEFAULT NULL,
+  `win64AuthSeed` varchar(32) DEFAULT NULL,
+  `mac64AuthSeed` varchar(32) DEFAULT NULL,
+  `winChecksumSeed` varchar(40) DEFAULT NULL,
+  `macChecksumSeed` varchar(40) DEFAULT NULL,
+  PRIMARY KEY (`build`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+--
+-- Dumping data for table `build_info`
+--
+INSERT INTO `build_info` VALUES
+(5875,1,12,1,NULL,NULL,NULL,NULL,'95EDB27C7823B363CBDDAB56A392E7CB73FCCA20','8D173CC381961EEBABF336F5E6675B101BB513E5'),
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