diff --git a/Ballance/BMapInspector/Rule.cpp b/Ballance/BMapInspector/Rule.cpp
index 6e7f36e..5917a6f 100644
--- a/Ballance/BMapInspector/Rule.cpp
+++ b/Ballance/BMapInspector/Rule.cpp
@@ -23,10 +23,9 @@ namespace BMapInspector::Rule {
 
 	Ruleset::Ruleset() : rules() {
 		// Add rule into list.
-		//rules.emplace_back(new GpRule1());
+		rules.emplace_back(new GpRule1());
 		rules.emplace_back(new GpRule2());
-		//rules.emplace_back(new Gp3Rule());
-		//rules.emplace_back(new Chirs1Rule());
+		rules.emplace_back(new ChirsRule1());
 		rules.emplace_back(new YYCRule1());
 		rules.emplace_back(new YYCRule2());
 		rules.emplace_back(new BBugRule1());
diff --git a/Ballance/BMapInspector/Rule/ChirsRules.cpp b/Ballance/BMapInspector/Rule/ChirsRules.cpp
index d3ca089..f694f09 100644
--- a/Ballance/BMapInspector/Rule/ChirsRules.cpp
+++ b/Ballance/BMapInspector/Rule/ChirsRules.cpp
@@ -1,18 +1,73 @@
 #include "ChirsRules.hpp"
+#include "Shared.hpp"
+
+namespace L = LibCmo;
+namespace C = LibCmo::CK2;
+namespace O = LibCmo::CK2::ObjImpls;
 
 namespace BMapInspector::Rule {
-	Chirs1Rule::Chirs1Rule() : IRule() {}
-	Chirs1Rule::~Chirs1Rule() {}
-	std::u8string_view Chirs1Rule::GetRuleName() const {
-		return u8"CHIRS1";
-	}
-	void Chirs1Rule::Check(Reporter::Reporter& reporter, Map::Level& level) const {
-		// Report error if there is some material named Laterne_Verlauf 
-		// but its texture is not pointed to Laterne_Verlauf texture.
 
-		// Report error if some materials' texture is Laterne_Verlauf,
+	// Reference: https://tieba.baidu.com/p/5913556704
+
+#pragma region Chirs Rule 1
+
+	constexpr char8_t CHIRS1[] = u8"CHIRS1";
+
+	ChirsRule1::ChirsRule1() : IRule() {}
+
+	ChirsRule1::~ChirsRule1() {}
+
+	std::u8string_view ChirsRule1::GetRuleName() const {
+		return CHIRS1;
+	}
+	void ChirsRule1::Check(Reporter::Reporter& reporter, Map::Level& level) const {
+		constexpr char8_t MTL_NAME[] = u8"Laterne_Verlauf";
+		auto* ctx = level.GetCKContext();
+
+		// Fetch Laterne_Verlauf first
+		auto* latern = Shared::FetchMaterial(ctx, MTL_NAME);
+		if (latern == nullptr) return;
+
+		// Report warning if this material's texture is not Laterne_Verlauf.tga
+		auto* latern_tex = latern->GetTexture();
+		if (latern_tex == nullptr) {
+			reporter.WriteWarning(CHIRS1,
+			                      u8R"(Find a material named "Laterne_Verlauf" but it doesn't have associated texture. )"
+			                      u8R"(It occupies the magic material "Laterne_Verlauf" which affect the ray of latern in game. Please confirm this is your intention.)");
+		} else {
+			if (!Shared::CheckTextureFileName(latern_tex, Shared::TextureNames::LATERNE_VERLAUF)) {
+				reporter.WriteWarning(CHIRS1,
+				                      u8R"(Find a material named "Laterne_Verlauf" but its texture is not "Laterne_Verlauf.tga". )"
+				                      u8R"(It occupies the magic material "Laterne_Verlauf" which affect the ray of latern in game. Please confirm this is your intention.)");
+			}
+		}
+
+		// Report warning if there is multiple Laterne_Verlauf material.
+		auto next_latern = ctx->GetObjectByNameAndClass(MTL_NAME, C::CK_CLASSID::CKCID_MATERIAL, latern);
+		if (next_latern != nullptr) {
+			reporter.WriteWarning(
+			    CHIRS1,
+			    u8R"(There are multiple materials named "Laterne_Verlauf". This will cause the disappearance of some latern's rays.)");
+		}
+
+		// Report warning if some materials' texture is Laterne_Verlauf,
 		// but its name is not Laterne_Verlauf.
+		for (auto* other_mtl : level.GetMaterials()) {
+			if (C::CKStrEqual(other_mtl->GetName(), MTL_NAME)) continue;
 
-		// Report error if there is multiple Laterne_Verlauf material.
+			auto other_mtl_tex = other_mtl->GetTexture();
+			if (other_mtl_tex == nullptr) continue;
+
+			if (Shared::CheckTextureFileName(other_mtl_tex, Shared::TextureNames::LATERNE_VERLAUF)) {
+				reporter.FormatWarning(
+				    CHIRS1,
+				    u8R"(Find material %s referring texture "Laterne_Verlauf.tga", but its name is not "Laterne_Verlauf". )"
+				    u8R"(Please confirm the usage of this material. If it is used as "Laterne_Verlauf", please rename it into "Laterne_Verlauf" to have correct latern ray.)",
+				    Shared::QuoteObjectName(other_mtl).c_str());
+			}
+		}
 	}
+
+#pragma endregion
+
 } // namespace BMapInspector::Rule
diff --git a/Ballance/BMapInspector/Rule/ChirsRules.hpp b/Ballance/BMapInspector/Rule/ChirsRules.hpp
index 009e536..b20094c 100644
--- a/Ballance/BMapInspector/Rule/ChirsRules.hpp
+++ b/Ballance/BMapInspector/Rule/ChirsRules.hpp
@@ -3,19 +3,17 @@
 
 namespace BMapInspector::Rule {
 
-	// Reference: https://tieba.baidu.com/p/5913556704
-
 	/**
-	 * @brief Chirs241097 Rule 1
+	 * @brief chirs241097 Rule 1
 	 * @details
 	 * This rule will make sure that there is only 1 texture named Laterne_Verlauf in map,
 	 * which represent the ray of latern.
 	 */
-	class Chirs1Rule : public IRule {
+	class ChirsRule1 : public IRule {
 	public:
-		Chirs1Rule();
-		virtual ~Chirs1Rule();
-		YYCC_DELETE_COPY_MOVE(Chirs1Rule)
+		ChirsRule1();
+		virtual ~ChirsRule1();
+		YYCC_DELETE_COPY_MOVE(ChirsRule1)
 
 	public:
 		std::u8string_view GetRuleName() const override;
diff --git a/Ballance/BMapInspector/Rule/GpRules.cpp b/Ballance/BMapInspector/Rule/GpRules.cpp
index da19e47..3b851f5 100644
--- a/Ballance/BMapInspector/Rule/GpRules.cpp
+++ b/Ballance/BMapInspector/Rule/GpRules.cpp
@@ -8,17 +8,25 @@ namespace O = LibCmo::CK2::ObjImpls;
 
 namespace BMapInspector::Rule {
 
+	// Reference: https://tieba.baidu.com/p/3182981807
+
 #pragma region GP1 Rule
 
+	constexpr char8_t GP1[] = u8"GP1";
+
 	GpRule1::GpRule1() : IRule() {}
 
 	GpRule1::~GpRule1() {}
 
 	std::u8string_view GpRule1::GetRuleName() const {
-		return u8"GP1";
+		return GP1;
 	}
 
-	void GpRule1::Check(Reporter::Reporter& reporter, Map::Level& level) const {}
+	void GpRule1::Check(Reporter::Reporter& reporter, Map::Level& level) const {
+		// TODO:
+		// Finish this rule.
+		// It is so complex that I don't want to implement it now.
+	}
 
 #pragma endregion
 
@@ -98,7 +106,8 @@ namespace BMapInspector::Rule {
 			auto sector_names = builder.get_sector9_names();
 			if (group_names.contains(sector_names.intuitive_name)) {
 				reporter.WriteWarning(
-				    GP2, u8R"(You are using intuitive sector name, "Sector_09", for sector 9. This is only accepted by new 999 sector loader.)");
+				    GP2,
+				    u8R"(You are using intuitive sector name, "Sector_09", for sector 9. This is only accepted by new 999 sector loader.)");
 			}
 		}
 
@@ -128,20 +137,4 @@ namespace BMapInspector::Rule {
 
 #pragma endregion
 
-#pragma region GP3 Rule
-	//
-	//	Gp3Rule::Gp3Rule() : IRule() {}
-	//
-	//	Gp3Rule::~Gp3Rule() {}
-	//
-	//	std::u8string_view Gp3Rule::GetRuleName() const {
-	//		return u8"GP3";
-	//	}
-	//
-	//	void Gp3Rule::Check(Reporter::Reporter& reporter, Map::Level& level) const {
-	//		// TODO: Mesh hash is not implemented.
-	//	}
-	//
-	//#pragma endregion
-
 } // namespace BMapInspector::Rule
diff --git a/Ballance/BMapInspector/Rule/GpRules.hpp b/Ballance/BMapInspector/Rule/GpRules.hpp
index e6ce3b1..4a223b0 100644
--- a/Ballance/BMapInspector/Rule/GpRules.hpp
+++ b/Ballance/BMapInspector/Rule/GpRules.hpp
@@ -3,8 +3,6 @@
 
 namespace BMapInspector::Rule {
     
-	// Reference: https://tieba.baidu.com/p/3182981807
-
     /**
      * @brief Gamepiaynmo Rule 1
 	 * @details
@@ -43,43 +41,4 @@ namespace BMapInspector::Rule {
 		void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
 	};
 
-	///**
-	// * @brief Gamepiaynmo Rule 2
-	// * @details
-	// * Every Ballance group should not have any groups with same name.
-	// */
-	//class GpRule2 : public IRule {
-	//public:
-	//	GpRule2();
-	//	virtual ~GpRule2();
-	//	YYCC_DELETE_COPY_MOVE(GpRule2)
-
-	//public:
-	//	std::u8string_view GetRuleName() const override;
-	//	void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
-	//};
-
-	///**
-	// * @brief Gamepiaynmo Rule 2
-	// * @details
-	// * This rule make sure that one Ballance element must be grouped into only one sector group.
-	// * Multiple grouping and none grouping will throw error.
-	// */
-	///**
-	// * @brief Gamepiaynmo Rule 3
-	// * @details
-	// * This rule make sure that all Ballance element is grouped into correct element group.
-	// * This rule will check the mesh of PH and guess which element it is.
-	// */
-	//class Gp3Rule : public IRule {
-	//public:
-	//	Gp3Rule();
-	//	virtual ~Gp3Rule();
-	//	YYCC_DELETE_COPY_MOVE(Gp3Rule)
-
-	//public:
-	//	std::u8string_view GetRuleName() const override;
-	//	void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
-	//};
-
 }
diff --git a/Ballance/BMapInspector/Rule/Shared.cpp b/Ballance/BMapInspector/Rule/Shared.cpp
index 2e59436..eb9b4b9 100644
--- a/Ballance/BMapInspector/Rule/Shared.cpp
+++ b/Ballance/BMapInspector/Rule/Shared.cpp
@@ -58,6 +58,10 @@ namespace BMapInspector::Rule::Shared {
 		}
 	}
 
+	O::CKMaterial* FetchMaterial(C::CKContext* ctx, L::CKSTRING name) {
+		return static_cast<O::CKMaterial*>(ctx->GetObjectByNameAndClass(name, C::CK_CLASSID::CKCID_MATERIAL, nullptr));
+	}
+
 	std::vector<O::CK3dObject*> FetchPhysicalized3dObjects(C::CKContext* ctx) {
 		std::vector<O::CK3dObject*> rv;
 
diff --git a/Ballance/BMapInspector/Rule/Shared.hpp b/Ballance/BMapInspector/Rule/Shared.hpp
index 99dc965..b515754 100644
--- a/Ballance/BMapInspector/Rule/Shared.hpp
+++ b/Ballance/BMapInspector/Rule/Shared.hpp
@@ -56,6 +56,7 @@ namespace BMapInspector::Rule::Shared {
 	namespace TextureNames {
 		// clang-format off
 		constexpr char8_t RAIL_ENVIRONMENT[] = u8"Rail_Environment.bmp";
+		constexpr char8_t LATERNE_VERLAUF[] = u8"Laterne_Verlauf.tga";
 		// clang-format on
 
 	} // namespace TextureNames
@@ -117,6 +118,13 @@ namespace BMapInspector::Rule::Shared {
 	 * @return Found pointer to CKGroup, otherwise nullptr.
 	 */
 	O::CKGroup* FetchGroup(C::CKContext* ctx, L::CKSTRING name);
+	/**
+	 * @brief 
+	 * @param[in] ctx Can not be nullptr.
+	 * @param[in] name Can not be nullptr.
+	 * @return Found pointer to CKMaterial, otherwise nullptr.
+	 */
+	O::CKMaterial* FetchMaterial(C::CKContext* ctx, L::CKSTRING name);
 	std::vector<O::CK3dObject*> FetchPhysicalized3dObjects(C::CKContext* ctx);
 	/**
 	 * @brief Check whether given CKTexture has the given file name (case-insensitive).