diff --git a/src/classes/types.gd b/src/classes/types.gd
index d6fa67c..003983b 100644
--- a/src/classes/types.gd
+++ b/src/classes/types.gd
@@ -29,3 +29,5 @@ enum LoggerLevel { NONE, SPECIAL, ERROR, WARN, INFO, VERB, DIAG }
 enum SceneType { NONE, DEBUG, CUTSCENE, MENU, MAIN, BACKGROUND }
 ## To what degree [i]something[/i] should be blocked.
 enum BlockadeLevel { IGNORE, WARN, BLOCK }
+## All rule types data can be checked against.
+enum ValidationType { MATCHES_TYPE, MATCHES_CLASS, IN_RANGE, HAS_MINIMUM, HAS_MAXIMUM, HAS_VALUES, CONTAINS, MATCHES_REGEX, IS_NOT_EMPTY, IS_NOT_NULL, IS_NORMALIZED, IS_ORTHONORMALIZED }
diff --git a/src/classes/validationsingle.gd b/src/classes/validationsingle.gd
new file mode 100644
index 0000000..dd773f2
--- /dev/null
+++ b/src/classes/validationsingle.gd
@@ -0,0 +1,280 @@
+extends Node
+class_name CoreValidationSingle
+
+## Internal, don't modify.
+var core: Core
+## Internal, don't modify.
+var logger: CoreLoggerInstance
+## Is set to the parent owning the validation single.[br]
+## [b]Note: [i]Don't modify.[/i][/b]
+var parent: Node
+## Contains the data to validate.[br]
+## [b]Note: [i]Don't modify.[/i][/b]
+var data  # This is the only instance where we don't want to define what type this variable should have
+
+## All rules to evalute in [method evaluate].[br]
+## [b]Note: [i]Don't modify.[/i][/b]
+var rules: Array[Dictionary]
+## The amount of failures.[br]
+## [b]Note: [i]Don't modify.[/i][/b]
+var failures: Array[String] = []
+
+# +++ constructor +++
+func _init(core_new: Core, data_new) -> void:
+	core = core_new
+	logger = core.logger.get_instance(core.basepath.replace("res://", "") + "src/classes/validationsingle.gd", self)
+	data = data_new
+
+# +++ evaluation +++
+## Evaluates all set rules and returns [code]true[/code] if all rules passed, or [code]false[/code] if at least one failed.
+func evaluate() -> bool:
+	# Reset failures
+	failures = []
+	
+	# Iterate through all rules
+	for rule in rules:
+		match(rule["type"]):
+			CoreTypes.ValidationType.MATCHES_TYPE:
+				var success: bool = false
+				for type in rule["types"]:
+					if typeof(data) == type:
+						success = true
+				
+				if !success:
+					var types_string: String = ""
+					for type in rule["types"]:
+						if types_string == "": types_string = type_string(type)
+						else: types_string = types_string + "|" + type_string(type)
+					failures.append(core.stringify_variables("Data is not of expected type(s) %expected% (is %got%)", { "expected": types_string, "got": type_string(typeof(data)) }))
+			CoreTypes.ValidationType.MATCHES_CLASS:
+				# If not an object, skip
+				if typeof(data) != Variant.Type.TYPE_OBJECT:
+					logger.warn("Can't match class as data is not of type Object")
+					continue
+				
+				if rule["exact"]:
+					# Only check if class name matches specified class
+					if data.get_class() != rule["class"]:
+						failures.append(core.stringify_variables("Expected exact class %expected% but data is of class %got%", { "expected": rule["class"], "got": data.get_class() }))
+				else:
+					# Check if class is or inherits specified class
+					if !data.is_class(rule["class"]):
+						failures.append(core.stringify_variables("Expected class %expected% but data is of class %got%", { "expected": rule["class"], "got": data.get_class() }))
+			CoreTypes.ValidationType.IN_RANGE:
+				# If not an int or float, skip
+				match(rule["matched_against"]):
+					"integer":
+						if typeof(data) != Variant.Type.TYPE_INT:
+							logger.warn("Can't match class as data is not of type int")
+							continue
+					"float":
+						if typeof(data) != Variant.Type.TYPE_FLOAT:
+							logger.warn("Can't match class as data is not of type float")
+							continue
+					_: logger.crash(core.stringify_variables("Invalid 'matched_against' value %value% for IN_RANGE", { "value": rule["matched_against"] }))
+				
+				# Check if from is bigger than to
+				if rule["from"] > rule["to"]:
+					logger.error(core.stringify_variables("Can't match invalid %type% range %from% to %to%", { "type": rule["matched_against"], "from": rule["from"], "to": rule["to"] }))
+					continue
+				
+				# Perform checks
+				if data < rule["from"]: failures.append(core.stringify_variables("Data is smaller than %type% range start %expected%", { "type": rule["matched_against"], "expected": rule["from"] }))
+				if data > rule["to"]: failures.append(core.stringify_variables("Data is larger than %type% range end %expected%", { "type": rule["matched_against"], "expected": rule["to"] }))
+			CoreTypes.ValidationType.HAS_MINIMUM:
+				# If not an int or float, skip
+				match(rule["matched_against"]):
+					"integer":
+						if typeof(data) != Variant.Type.TYPE_INT:
+							logger.warn("Can't determine if data has minimum value as data is not of type int")
+							continue
+					"float":
+						if typeof(data) != Variant.Type.TYPE_FLOAT:
+							logger.warn("Can't determine if data has minimum value as data is not of type float")
+							continue
+					_: logger.crash(core.stringify_variables("Invalid 'matched_against' value %value% for HAS_MINIMUM", { "value": rule["matched_against"] }))
+				
+				# Perform check
+				if data < rule["minimum"]: failures.append(core.stringify_variables("Data is smaller than minimum %type% value %expected%", { "type": rule["matched_against"], "expected": rule["minimum"] }))
+			CoreTypes.ValidationType.HAS_MAXIMUM:
+				# If not an int or float, skip
+				match(rule["matched_against"]):
+					"integer":
+						if typeof(data) != Variant.Type.TYPE_INT:
+							logger.warn("Can't determine if data has maximum value as data is not of type int")
+							continue
+					"float":
+						if typeof(data) != Variant.Type.TYPE_FLOAT:
+							logger.warn("Can't determine if data has maximum value as data is not of type float")
+							continue
+					_: logger.crash(core.stringify_variables("Invalid 'matched_against' value %value% for HAS_MINIMUM", { "value": rule["matched_against"] }))
+				
+				# Perform check
+				if data > rule["maximum"]: failures.append(core.stringify_variables("Data is smaller than minimum %type% value %expected%", { "type": rule["matched_against"], "expected": rule["maximum"] }))
+			CoreTypes.ValidationType.HAS_VALUES:
+				# Used later
+				var success: bool = false
+				
+				if rule["all_required"]:
+					# Invert usage
+					success = true
+					
+					for value in rule["values"]:
+						if data != value:
+							# One value did not match
+							success = false
+					
+					if !success: failures.append("Data did not match all provided values")
+				else:
+					for value in rule["values"]:
+						if data == value:
+							# One value did match
+							success = true
+					
+					if !success: failures.append("Data did not match a single provided value")
+			CoreTypes.ValidationType.CONTAINS:
+				# If not a String or StringName, skip
+				if typeof(data) != Variant.Type.TYPE_STRING or typeof(data) != Variant.Type.TYPE_STRING_NAME:
+					logger.warn("Can't determine if data contains values as data is not of type String or StringName")
+					continue
+				
+				var successes: int = 0
+				for value in rule["values"]:
+					if data.contains(value):
+						successes += 1
+				
+				# Success if equals or bigger than 'minimum_matches'
+				if successes < rule["minimum_matches"]: failures.append(core.stringify_variables("Data did matched %got% out of %expected% expected strings", { "got": successes, "expected": rule["minimum_matches"] }))
+			CoreTypes.ValidationType.MATCHES_REGEX:
+				# If not a String or StringName, skip
+				if typeof(data) != Variant.Type.TYPE_STRING or typeof(data) != Variant.Type.TYPE_STRING_NAME:
+					logger.warn("Can't determine if data matches regex as data is not of type String or StringName")
+					continue
+				
+				var regex: RegEx = RegEx.new()
+				# Compile regex
+				regex.compile(rule["regex_string"])
+				# Get result
+				var result: RegExMatch = regex.search(data)
+				# If result yielded no result, fail
+				if !result: failures.append(core.stringify_variables("Data doesn't match regex %regex%", { "regex": rule["regex_string"] }))
+			CoreTypes.ValidationType.IS_NOT_EMPTY:
+				match(typeof(data)):
+					Variant.Type.TYPE_STRING: if data == "": failures.append("Data string is empty")
+					Variant.Type.TYPE_STRING_NAME: if data == "": failures.append("Data string name is empty")
+					Variant.Type.TYPE_INT: if data == 0: failures.append("Data integer is zero")
+					Variant.Type.TYPE_FLOAT: if data == 0.0: failures.append("Data float is zero")
+					# If not a String, StringName, int or float, skip
+					_: logger.warn("Can't determine if data is null as data is not of type String, StringName, int or float")
+			CoreTypes.ValidationType.IS_NOT_NULL:
+				# ⡴⠑⡄⠀⠀⠀⠀⠀⠀⠀ ⣀⣀⣤⣤⣤⣀⡀
+				# ⠸⡇⠀⠿⡀⠀⠀⠀⣀⡴⢿⣿⣿⣿⣿⣿⣿⣿⣷⣦⡀
+				# ⠀⠀⠀⠀⠑⢄⣠⠾⠁⣀⣄⡈⠙⣿⣿⣿⣿⣿⣿⣿⣿⣆
+				# ⠀⠀⠀⠀⢀⡀⠁⠀⠀⠈⠙⠛⠂⠈⣿⣿⣿⣿⣿⠿⡿⢿⣆
+				# ⠀⠀⠀⢀⡾⣁⣀⠀⠴⠂⠙⣗⡀⠀⢻⣿⣿⠭⢤⣴⣦⣤⣹⠀⠀⠀⢀⢴⣶⣆
+				# ⠀⠀⢀⣾⣿⣿⣿⣷⣮⣽⣾⣿⣥⣴⣿⣿⡿⢂⠔⢚⡿⢿⣿⣦⣴⣾⠸⣼⡿
+				# ⠀⢀⡞⠁⠙⠻⠿⠟⠉⠀⠛⢹⣿⣿⣿⣿⣿⣌⢤⣼⣿⣾⣿⡟⠉
+				# ⠀⣾⣷⣶⠇⠀⠀⣤⣄⣀⡀⠈⠻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡇
+				# ⠀⠉⠈⠉⠀⠀⢦⡈⢻⣿⣿⣿⣶⣶⣶⣶⣤⣽⡹⣿⣿⣿⣿⡇
+				# ⠀⠀⠀⠀⠀⠀⠀⠉⠲⣽⡻⢿⣿⣿⣿⣿⣿⣿⣷⣜⣿⣿⣿⡇
+				# ⠀⠀ ⠀⠀⠀⠀⠀⢸⣿⣿⣷⣶⣮⣭⣽⣿⣿⣿⣿⣿⣿⣿⠇
+				# ⠀⠀⠀⠀⠀⠀⣀⣀⣈⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠇
+				# ⠀⠀⠀⠀⠀⠀⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠃
+				# https://steamcommunity.com/sharedfiles/filedetails/?id=2902061979
+				if data == null: failures.append("Data is null")
+			CoreTypes.ValidationType.IS_NORMALIZED:
+				# If not a Vector2, Vector3, Vector4, Plane or Quaternion, skip
+				match(typeof(data)):
+					Variant.Type.TYPE_VECTOR2: pass
+					Variant.Type.TYPE_VECTOR3: pass
+					Variant.Type.TYPE_VECTOR4: pass
+					Variant.Type.TYPE_PLANE: pass
+					Variant.Type.TYPE_QUATERNION: pass
+					_:
+						logger.warn("Can't determine if data is normalized as data is not of type Vector2, Vector3, Vector4, Plane or Quaternion")
+						continue
+				
+				# Perform check
+				if !data.is_normalized(): failures.append("Data is not normalized")
+			CoreTypes.ValidationType.IS_ORTHONORMALIZED:
+				# If not a Transform2D, Transform3D, or Basis, skip
+				match(typeof(data)):
+					Variant.Type.TYPE_TRANSFORM2D: pass
+					Variant.Type.TYPE_TRANSFORM3D: pass
+					Variant.Type.TYPE_BASIS: pass
+					_:
+						logger.warn("Can't determine if data is orthonormalized as data is not of type Transform2D, Transform3D or Basis")
+						continue
+				
+				# Perform check
+				if !data.is_orthonormalized(): failures.append("Data is not orthonormalized")
+			_: await logger.crash(core.stringify_variables("Invalid validation rule type %type%", { "type": rule["type"] }))
+	
+	return failures.size() == 0
+
+# +++ types and classes +++
+## Validates if [param data] matches some [enum Variant.Type].
+func matches_type(types: Array[Variant.Type]) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.MATCHES_TYPE, "types": types })
+	return self
+
+## Validates if [param data] matches some class.
+func matches_class(clazz: StringName, exact: bool) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.MATCHES_CLASS, "class": clazz, "exact": exact })
+	return self
+
+# +++ ranges +++
+## Validates if [param data] contains 
+func in_range_int(from: int, to: int) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.IN_RANGE, "matched_against": "integer", "from": from, "to": to })
+	return self
+
+func in_range_float(from: float, to: float) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.IN_RANGE, "matched_against": "float", "from": from, "to": to })
+	return self
+
+func has_minimum_value_int(minimum: int) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.HAS_MINIMUM, "matched_against": "integer", "minimum": minimum })
+	return self
+
+func has_maximum_value_int(maximum: int) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.HAS_MAXIMUM, "matched_against": "integer", "maximum": maximum })
+	return self
+
+func has_minimum_value_float(minimum: float) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.HAS_MINIMUM, "matched_against": "float", "minimum": minimum })
+	return self
+
+func has_maximum_value_float(maximum: float) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.HAS_MAXIMUM, "matched_against": "float", "maximum": maximum })
+	return self
+
+# +++ values +++
+func has_values(values: Array, all_required: bool) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.HAS_VALUES, "values": values, "all_required": all_required })
+	return self
+
+func contains(values: Array[String], minimum_matches: int = 1) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.HAS_VALUES, "values": values, "minimum_matches": minimum_matches })
+	return self
+
+func matches_regex(regex_string: String) -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.MATCHES_REGEX, "regex_string": regex_string })
+	return self
+
+# +++ empty/null and booleans +++
+func is_not_empty() -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.IS_NOT_EMPTY })
+	return self
+
+func is_not_null() -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.IS_NOT_NULL })
+	return self
+
+func is_normalized() -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.IS_NORMALIZED })
+	return self
+
+func is_orthonormalized() -> CoreValidationSingle:
+	rules.append({ "type": CoreTypes.ValidationType.IS_ORTHONORMALIZED })
+	return self
diff --git a/src/core.gd b/src/core.gd
index 27d27d4..e943a7b 100644
--- a/src/core.gd
+++ b/src/core.gd
@@ -34,7 +34,7 @@ const version_fork: String = ""
 
 # Modules
 ## Used internally for loading, managing and unloading modules.
-const modules: Array[String] = [ "logger", "misc", "sms", "logui", "erm", "storage" ]
+const modules: Array[String] = [ "logger", "misc", "sms", "logui", "erm", "storage", "validation" ]
 ## CORE's configuration object.[br]
 ## [b]NEVER access this yourself! To change the configuration use [method reload_configuration] instead.[/b]
 var config: CoreConfiguration
@@ -54,6 +54,8 @@ var logui: CoreBaseModule
 var erm: CoreBaseModule
 ## The 'Storage' module
 var storage: CoreBaseModule
+## The 'Data Validation' module
+var validation: CoreBaseModule
 
 # /etc/
 ## Stores the path to CORE's installation directory.[br]
diff --git a/src/validation.gd b/src/validation.gd
new file mode 100644
index 0000000..c8c0bc6
--- /dev/null
+++ b/src/validation.gd
@@ -0,0 +1,47 @@
+# CORE FRAMEWORK SOURCE FILE
+# Copyright (c) 2024 The StarOpenSource Project & Contributors
+# Licensed under the GNU Affero General Public License v3
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+# 
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+## Allows for data validation.
+extends CoreBaseModule
+
+#var schemas: Dictionary
+var singles: Array[CoreValidationSingle]
+
+# +++ module +++
+func _cleanup() -> void:
+	var singles_remove_enty: Array[CoreLoggerInstance] = []
+	for single in singles:
+		singles_remove_enty.append(single)
+		if !is_instance_valid(single): continue
+		if !is_instance_valid(single.parent):
+			logger.diag("Removing single '" + single.name + "'")
+			single.queue_free()
+	for single in singles_remove_enty:
+		singles.remove_at(singles.find(single))
+func _schedule() -> void:
+	for single in singles:
+		if is_instance_valid(single):
+			logger.diag("Removing single '" + single.name + "'")
+			single.queue_free()
+
+# +++ data validation +++
+#func get_schema(Dictionary schema) -> CoreValidationSchema:
+#	return CoreValidationSchema.new(core, schema)
+
+func get_single(data, parent) -> CoreValidationSingle:
+	singles.append(parent)
+	return CoreValidationSingle.new(core, data)