diff --git a/lang/en.json b/lang/en.json
index 5a46739..c96f9b8 100644
--- a/lang/en.json
+++ b/lang/en.json
@@ -216,5 +216,6 @@
 
     "DG.Roll.Inhuman": "Inhuman",
     "DG.Tooltip.BreakPoint": "The current breaking point, reset when current sanity falls to or below this value.  The starting breaking point is SAN - POW.",
-    "DG.Tooltip.BreakPointReset": "Reset breaking point to be current SAN - WP."
+    "DG.Tooltip.BreakPointReset": "Reset breaking point to be current SAN - WP.",
+    "DG.Skills.ritual": "Ritual"
 }
\ No newline at end of file
diff --git a/lang/es.json b/lang/es.json
index 3bf16a1..fb0a73a 100644
--- a/lang/es.json
+++ b/lang/es.json
@@ -216,5 +216,6 @@
 
     "DG.Roll.Inhuman": "Inhumano",
     "DG.Tooltip.BreakPoint": "The current breaking point, reset when current sanity falls to or below this value.  The starting breaking point is SAN - POW.",
-    "DG.Tooltip.BreakPointReset": "Reset breaking point to be current SAN - WP."
+    "DG.Tooltip.BreakPointReset": "Reset breaking point to be current SAN - WP.",
+    "DG.Skills.ritual": "Ritual"
 }
\ No newline at end of file
diff --git a/lang/ja.json b/lang/ja.json
index bf70607..e7e4a78 100644
--- a/lang/ja.json
+++ b/lang/ja.json
@@ -216,5 +216,6 @@
 
     "DG.Roll.Inhuman": "人ならざるもの",
     "DG.Tooltip.BreakPoint": "現在のブレーキポイント。初めの数値は「正気　ー　判断力」。",
-    "DG.Tooltip.BreakPointReset": "ブレーキポイントをレセットする。新しい数値は「正気　ー　判断力」。"
+    "DG.Tooltip.BreakPointReset": "ブレーキポイントをレセットする。新しい数値は「正気　ー　判断力」。",
+    "DG.Skills.ritual": "秘儀"
 }
\ No newline at end of file
diff --git a/module/actor/actor.js b/module/actor/actor.js
index a776119..2ccef31 100644
--- a/module/actor/actor.js
+++ b/module/actor/actor.js
@@ -34,6 +34,20 @@ export class DeltaGreenActor extends Actor {
       statistic.x5 = statistic.value * 5;
     }
     
+    actorData.data.skills.ritual = {
+      label: "Ritual",
+      proficiency: 99 - actorData.data.sanity.value,
+      cannotBeImprovedByFailure: true,
+      failure: false
+    };
+
+    if(actorData.data.skills.ritual.proficiency > 99){
+      actorData.data.skills.ritual.proficiency = 99
+    }
+    else if(actorData.data.skills.ritual.proficiency < 1){
+      actorData.data.skills.ritual.proficiency = 1
+    }
+
     // The unnatural skill is sort of special
     // It cannot be improved via failure, so add in a special property to reflect this
     // Mostly to make it easy to deactivate the failure checkbox in the GUI
@@ -41,13 +55,22 @@ export class DeltaGreenActor extends Actor {
       if(key === 'unnatural'){
         skill.cannotBeImprovedByFailure = true;
       }
-      else if(key==='luck'){
+      else if(key === 'luck'){
         skill.cannotBeImprovedByFailure = true;
       }
       else{
         skill.cannotBeImprovedByFailure = false;
       }
+
+      // For ritual skill, it's calculated, so add some logic to turn off changing that entirely.
+      if(key === 'ritual'){
+        skill.isCalculatedValue = true;
+      }
+      else{
+        skill.isCalculatedValue = false;
+      }
     }
+
     actorData.data.wp.max = actorData.data.statistics.pow.value;
 
     actorData.data.health.max = Math.ceil((actorData.data.statistics.con.value + actorData.data.statistics.str.value) / 2);
diff --git a/templates/actor/actor-sheet.html b/templates/actor/actor-sheet.html
index cd4ed46..4fbc7cf 100644
--- a/templates/actor/actor-sheet.html
+++ b/templates/actor/actor-sheet.html
@@ -84,7 +84,7 @@
                     >
                     {{ localize (concat "DG.Skills." key) }}
                   </label>
-                  <input class="percentile-skill-input" type="text" name="data.skills.{{key}}.proficiency" value="{{skill.proficiency}}" data-dtype="Number"/>
+                  <input class="percentile-skill-input" type="text" name="data.skills.{{key}}.proficiency" value="{{skill.proficiency}}" data-dtype="Number" {{#if skill.isCalculatedValue}} disabled {{/if}}/>
                   <input type="checkbox" name="data.skills.{{key}}.failure" {{checked skill.failure}} data-dtype="Boolean" {{#if skill.cannotBeImprovedByFailure}} disabled {{/if}} 
                     title="{{localize 'DG.Tooltip.SkillFailCheckbox'}}"
                     />