diff --git a/HellionChat/Configuration.cs b/HellionChat/Configuration.cs
index 557e8cb..d874a17 100755
--- a/HellionChat/Configuration.cs
+++ b/HellionChat/Configuration.cs
@@ -34,7 +34,7 @@ public class ConfigKeyBind
 [Serializable]
 public class Configuration : IPluginConfiguration
 {
-    private const int LatestVersion = 14;
+    private const int LatestVersion = 15;
 
     public int Version { get; set; } = LatestVersion;
 
@@ -80,19 +80,6 @@ public class Configuration : IPluginConfiguration
     // ChatTwo users skip it because the v6→v7 migration sets the flag.
     public bool FirstRunCompleted;
 
-    // Hellion Chat global ImGui theme — applied to every plugin window in
-    // Plugin.Draw. Default ON; users who prefer the upstream Dalamud look
-    // can flip this off in the Privacy tab.
-    [Obsolete("Replaced by Theme slug + WindowOpacity in v14")]
-    public bool HellionThemeEnabled = true;
-
-    // Window background opacity, 0.5–1.0. Lower values make the plugin
-    // panes more glass-like so the game shines through. Default 0.5
-    // matches the maintainer's daily-driver preference; users who want
-    // a less translucent look bump it up in Aussehen → Theme.
-    [Obsolete("Replaced by WindowOpacity in v14")]
-    public float HellionThemeWindowOpacity = 0.5f;
-
     // Use the bundled Exo 2 font (OFL-1.1) for the regular plugin font
     // instead of whatever GlobalFontV2.FontId points at. Default ON so a
     // fresh install gets the Hellion typography out-of-the-box; flip OFF
@@ -336,10 +323,6 @@ public class Configuration : IPluginConfiguration
         RetentionLastRunAt = other.RetentionLastRunAt;
 
         FirstRunCompleted = other.FirstRunCompleted;
-#pragma warning disable CS0612, CS0618 // Obsolete-Felder bleiben bis v1.2.0 als JSON-Safety-Net erhalten
-        HellionThemeEnabled = other.HellionThemeEnabled;
-        HellionThemeWindowOpacity = other.HellionThemeWindowOpacity;
-#pragma warning restore CS0612, CS0618
         UseHellionFont = other.UseHellionFont;
 
         // v1.1.0 theme engine fields
diff --git a/HellionChat/Plugin.cs b/HellionChat/Plugin.cs
index 2b58150..8a2f153 100755
--- a/HellionChat/Plugin.cs
+++ b/HellionChat/Plugin.cs
@@ -247,9 +247,8 @@ public sealed class Plugin : IDalamudPlugin
             if (Config.Version < 14)
             {
                 Config.Theme = "hellion-arctic";
-                #pragma warning disable CS0612, CS0618 // Obsolete: HellionThemeWindowOpacity bleibt readable bis v1.2.0
-                Config.WindowOpacity = Config.HellionThemeWindowOpacity;
-                #pragma warning restore CS0612, CS0618
+                // v1.2.0: alter Opacity-Wert wird nicht mehr migriert (Field entfernt).
+                // User die direkt v13 → v15 springen bekommen den Default 0.85.
                 Config.ReduceMotion = false;
                 Config.UseCompactDensity = false;
                 Config.ShowThemeQuickPicker = false;
@@ -260,6 +259,20 @@ public sealed class Plugin : IDalamudPlugin
                     "pick chat2-classic in Settings → Themes for the upstream look");
             }
 
+            if (Config.Version < 15)
+            {
+                // v1.2.0 — keine Datenmigration nötig. Removal der deprecated
+                // Theme-Felder ist reine Schema-Bereinigung (System.Text.Json
+                // ignoriert unbekannte Felder im JSON, daher kein Crash bei
+                // Configs die noch HellionThemeEnabled/HellionThemeWindowOpacity
+                // serialisiert haben — die Werte verfallen einfach).
+                Config.Version = 15;
+                SaveConfig();
+                Log.Information(
+                    "Migrated config v14 → v15: legacy theme fields removed " +
+                    "(HellionThemeEnabled, HellionThemeWindowOpacity)");
+            }
+
             // Hellion v1.0.0 default tab layout. Five thematically separated
             // tabs: General catches the immediate-surroundings public chat
             // (Say/Yell/Shout) only; System absorbs the rest of the technical
diff --git a/HellionChat/Ui/SettingsTabs/Appearance.cs b/HellionChat/Ui/SettingsTabs/Appearance.cs
index 5cde2ee..ba07ee3 100644
--- a/HellionChat/Ui/SettingsTabs/Appearance.cs
+++ b/HellionChat/Ui/SettingsTabs/Appearance.cs
@@ -45,32 +45,11 @@ internal sealed class Appearance : ISettingsTab
 
         using (ImRaii.PushIndent(ImGui.GetStyle().IndentSpacing, false))
         {
-            // v1.1.0 — Diese Settings-UI wird in Phase J durch den dedizierten
-            // Themes-Tab ersetzt. Bis dahin bleiben die alten Toggles erhalten,
-            // damit die Settings-Seite kompiliert; sie schreiben in die mit
-            // [Obsolete] markierten Felder, die bis v1.2.0 als JSON-Safety-Net
-            // bestehen bleiben. Das pragma unterdrückt die CS0612-Warnungen
-            // gezielt für diesen Übergangs-Block.
-#pragma warning disable CS0612, CS0618
-            ImGui.Checkbox(HellionStrings.Theme_Enabled_Name, ref Mutable.HellionThemeEnabled);
-            ImGuiUtil.HelpMarker(HellionStrings.Theme_Enabled_Description);
-
-            // Clamp 0.5–1.0 stays consistent with Privacy.cs which already
-            // shipped this slider; lower values would let chat windows
-            // disappear behind game UI.
-            using (ImRaii.Disabled(!Mutable.HellionThemeEnabled))
-            {
-                ImGui.SetNextItemWidth(200f * ImGuiHelpers.GlobalScale);
-                var opacity = Mutable.HellionThemeWindowOpacity;
-                if (ImGui.SliderFloat($"{HellionStrings.Theme_WindowOpacity_Label}##theme-opacity", ref opacity, 0.5f, 1.0f, "%.2f"))
-                {
-                    Mutable.HellionThemeWindowOpacity = Math.Clamp(opacity, 0.5f, 1.0f);
-                }
-                ImGuiUtil.HelpMarker(HellionStrings.Theme_WindowOpacity_Help);
-            }
-
-            ImGui.Spacing();
-
+            // v1.2.0 — Legacy HellionThemeEnabled/HellionThemeWindowOpacity-Bindings
+            // entfernt. Theme-Auswahl + globale Window-Opacity leben jetzt in
+            // Settings → Themes (eingeführt mit v1.1.0). Hier verbleibt nur der
+            // klassische OverrideStyle-Toggle plus der Bestand-WindowAlpha-Slider
+            // für das Chat-Log-Fenster.
             ImGui.Checkbox(Language.Options_OverrideStyle_Name, ref Mutable.OverrideStyle);
             ImGuiUtil.HelpMarker(Language.Options_OverrideStyle_Name_Desc);
 
@@ -79,16 +58,7 @@ internal sealed class Appearance : ISettingsTab
                 DrawStyleCombo();
             }
 
-            // The Bestand-Slider WindowAlpha targets the chat log window's
-            // background only. The Hellion theme opacity above already covers
-            // every plugin window globally, so the two sliders fight each
-            // other when the theme is active. Disable the legacy slider in
-            // that case to make Hellion theme the single source of truth.
-            using (ImRaii.Disabled(Mutable.HellionThemeEnabled))
-            {
-                ImGuiUtil.DragFloatVertical(Language.Options_WindowOpacity_Name, ref Mutable.WindowAlpha, .25f, 0f, 100f, $"{Mutable.WindowAlpha:N2}%%", ImGuiSliderFlags.AlwaysClamp);
-            }
-#pragma warning restore CS0612, CS0618
+            ImGuiUtil.DragFloatVertical(Language.Options_WindowOpacity_Name, ref Mutable.WindowAlpha, .25f, 0f, 100f, $"{Mutable.WindowAlpha:N2}%%", ImGuiSliderFlags.AlwaysClamp);
         }
     }