diff --git a/SchemaValidator/SchemaValidator.cs b/SchemaValidator/SchemaValidator.cs
index cf6d4d2..1499b6f 100644
--- a/SchemaValidator/SchemaValidator.cs
+++ b/SchemaValidator/SchemaValidator.cs
@@ -43,9 +43,11 @@ public class SchemaValidator
 			new MultiLinkRefValidator(gameData, testDict),
 			new ConditionValidator(gameData),
 			new ConditionRefValidator(gameData, testDict),
+			new DuplicateFieldNameValidator(gameData),
 		};
 
-		// var exl = gameData.GetFile<ExcelListFile>("exd/root.exl");
+		var exl = gameData.GetFile<ExcelListFile>("exd/root.exl");
+		var existingSheets = exl.ExdMap.Select(s => s.Key).ToHashSet();
 		var results = new ValidationResults();
 		
 		foreach (var schemaPath in Directory.GetFiles(schemaDir, "*.yml"))
@@ -54,8 +56,7 @@ public class SchemaValidator
 			var exh = gameData.GetFile<ExcelHeaderFile>($"exd/{sheetName}.exh");
 			if (exh == null)
 			{
-				Console.Error.WriteLine($"Sheet {sheetName} does not exist!");
-				continue;
+				results.Add(ValidationResult.Error(sheetName, "SheetExistsValidator", "Schema exists but sheet does not!"));
 			}
 
 			Sheet sheet;
@@ -81,7 +82,16 @@ public class SchemaValidator
 			
 			foreach (var validator in validators)
 				results.Add(validator.Validate(exh, sheet));
+			existingSheets.Remove(sheetName);
 		}
+
+		foreach (var sheet in existingSheets)
+		{
+			if (sheet.Contains('/')) continue;
+			results.Add(ValidationResult.Error(sheet, "SchemaDefinedValidator", "Sheet exists but has no schema!"));
+		}
+		
+		// ---
 		
 		foreach (var result in results.Results.Where(r => r.Status == ValidationStatus.Warning))
 		{
diff --git a/SchemaValidator/Util/SchemaUtil.cs b/SchemaValidator/Util/SchemaUtil.cs
index 9c97773..c68bd8a 100644
--- a/SchemaValidator/Util/SchemaUtil.cs
+++ b/SchemaValidator/Util/SchemaUtil.cs
@@ -103,18 +103,4 @@ public static class SchemaUtil
 		}
 		return 1;
 	}
-	
-	public static Field GetFieldByIndex(Sheet schema, int index)
-	{
-		foreach (var field in schema.Fields)
-		{
-			
-		}
-		return null;
-	}
-
-	public static Field GetFieldByIndex(Field field, int index, int baseIndex)
-	{
-		return null;
-	}
 }
\ No newline at end of file
diff --git a/SchemaValidator/Util/SerializeUtil.cs b/SchemaValidator/Util/SerializeUtil.cs
index f06fbc4..b0d45fa 100644
--- a/SchemaValidator/Util/SerializeUtil.cs
+++ b/SchemaValidator/Util/SerializeUtil.cs
@@ -23,8 +23,6 @@ public static class SerializeUtil
 			NamingConvention = new CamelCaseNamingConvention(),
 			IgnoreNulls = true,
 		};
-		settings.RegisterSerializer(typeof(Dictionary<int, List<string>>), new CustomDictionarySerializer());
-		settings.RegisterSerializer(typeof(FieldType), new CustomFieldTypeSerializer());
 
 		_serializer = new Serializer(settings);
 	}
@@ -43,51 +41,4 @@ public static class SerializeUtil
 	{
 		return _serializer.Deserialize(s);
 	}
-	
-	public static EvaluationResults? EvaluateSchema(string filePath)
-	{
-		var yamlText = File.ReadAllText(filePath);
-		object? yamlObject;
-		try
-		{
-			yamlObject = _serializer.Deserialize(yamlText);
-		}
-		catch (Exception e)
-		{
-			Console.WriteLine(e);
-			return null;
-		}
-		if (yamlObject == null) return null;
-		
-		var json = JsonConvert.SerializeObject(yamlObject);
-		// Console.WriteLine(json);
-		// File.WriteAllText(@"C:\Users\Liam\Documents\repos\EXDSchema\SchemaValidator\test.json", json);
-
-		var schemaText = File.ReadAllText(@"C:\Users\Liam\Documents\repos\EXDSchema\SchemaValidator\SchemaSchema.json");
-		var schema = JsonSchema.FromText(schemaText);
-		var node = JsonNode.Parse(json);
-		return schema.Evaluate(node);
-	}
 }
-
-internal class CustomDictionarySerializer : DictionarySerializer
-{
-	protected override void WriteDictionaryItem(ref ObjectContext objectContext, KeyValuePair<object, object?> keyValue, KeyValuePair<Type, Type> types)
-	{
-		objectContext.SerializerContext.WriteYaml(keyValue.Key, types.Key);
-		objectContext.SerializerContext.WriteYaml(keyValue.Value, types.Value, YamlStyle.Flow);
-	}
-}
-
-internal class CustomFieldTypeSerializer : ScalarSerializerBase
-{
-	public override object? ConvertFrom(ref ObjectContext context, Scalar fromScalar)
-	{
-		return Enum.Parse<FieldType>(new PascalNamingConvention().Convert(fromScalar.Value));
-	}
-	
-	public override string ConvertTo(ref ObjectContext objectContext)
-	{
-		return objectContext.Settings.NamingConvention.Convert(objectContext.Instance.ToString());
-	}
-}
\ No newline at end of file
diff --git a/SchemaValidator/Validation/Validators/DuplicateFieldNameValidator.cs b/SchemaValidator/Validation/Validators/DuplicateFieldNameValidator.cs
new file mode 100644
index 0000000..a1f663e
--- /dev/null
+++ b/SchemaValidator/Validation/Validators/DuplicateFieldNameValidator.cs
@@ -0,0 +1,53 @@
+using Lumina;
+using Lumina.Data.Files.Excel;
+using SchemaValidator.New;
+using SchemaValidator.Util;
+
+namespace SchemaValidator.Validation.Validators;
+
+public class DuplicateFieldNameValidator : Validator
+{
+	public override string ValidatorName() => "DuplicateFieldNameValidator";
+	
+	public DuplicateFieldNameValidator(GameData gameData) : base(gameData) { }
+
+	private string _sheetName;
+	
+	public override ValidationResults Validate(ExcelHeaderFile exh, Sheet sheet)
+	{
+		_sheetName = sheet.Name;
+		
+		var fieldNames = new HashSet<string>();
+		var results = new ValidationResults();
+		foreach (var field in sheet.Fields)
+		{
+			results.Add(Validate(field));
+			if (fieldNames.Contains(field.Name))
+				return ValidationResults.Error(sheet.Name, ValidatorName(), $"Duplicate field name {field.Name}");
+			fieldNames.Add(field.Name);
+		}
+		
+		if (results.Results.Count == 0)
+			return ValidationResults.Success(sheet.Name, ValidatorName());
+		return results;
+	}
+
+	private ValidationResults Validate(Field field)
+	{
+		var results = new ValidationResults();
+		var fieldNames = new HashSet<string>();
+
+		if (field.Fields != null)
+		{
+			foreach (var subField in field.Fields)
+			{
+				Validate(subField);
+				if (fieldNames.Contains(subField.Name))
+					results.Add(ValidationResult.Error(_sheetName, ValidatorName(), $"Duplicate field name {subField.Name}"));
+				fieldNames.Add(subField.Name);
+			}	
+		}
+		
+		return results;
+	}
+}
\ No newline at end of file