diff --git a/Source/Client/Session.h b/Source/Client/Session.h
index dd81352..add6d9b 100644
--- a/Source/Client/Session.h
+++ b/Source/Client/Session.h
@@ -212,6 +212,8 @@ public:
   void CollectCardItems();
   int GetRobeAlpha(int robeId);
   bool IsTopLayerRobe(int robe);
+  int IsSkillIdInRange6018(unsigned id) const;
+  int IsSkillIdInRange6001(unsigned id) const;
 };
 
 extern CSession g_session;
diff --git a/Source/UI/Shortcuts/ShortcutCooldowns.cpp b/Source/UI/Shortcuts/ShortcutCooldowns.cpp
index 72729e2..82a4354 100644
--- a/Source/UI/Shortcuts/ShortcutCooldowns.cpp
+++ b/Source/UI/Shortcuts/ShortcutCooldowns.cpp
@@ -1,3 +1,4 @@
+#include "Client/Session.h"
 #include "UI/Shortcuts/ShortcutCooldowns.h"
 
 #include <algorithm>
@@ -19,6 +20,18 @@ namespace {
   }
 }
 
+// OFFSET: 0x00E1DCE0
+// FUNCTION: fn_23876
+int CSession::IsSkillIdInRange6018(unsigned id) const {
+  return id - 6018u <= 34;
+}
+
+// OFFSET: 0x00E1DD00
+// FUNCTION: fn_23877
+int CSession::IsSkillIdInRange6001(unsigned id) const {
+  return id - 6001u <= 51;
+}
+
 // OFFSET: 0x00D42070
 // FUNCTION: fn_21827
 void ShortcutCooldowns::LoadSnapshot(