Added modifier to skills

system/scripts/actors/base-character-sheet.js

@@ -232,6 +232,7 @@ export class BaseCharacterSheetL5r5e extends BaseSheetL5r5e {
 
             case "skill":
                 itemData.system.rank = 0;
+                itemData.system.modifier = 0;
                 break;
 
             case "technique":

system/scripts/handlebars.js

@@ -64,6 +64,12 @@ export const RegisterHandlebars = function () {
         return objects.join("");
     });
 
+    // Make the sum of values
+    Handlebars.registerHelper('sum', function(...nb) {
+        nb.pop(); // remove this function call
+        return nb.reduce((acc, n) => acc + Number(n ?? 0), 0);
+    });
+
     // Add a setter
     Handlebars.registerHelper("setVar", function (varName, varValue, options) {
         options.data.root[varName] = varValue;