New source found from dndbeyond.com

ddb_main/packages/rules-engine/es/engine/Class/accessors.js

@@ -437,6 +437,13 @@ export function getUniqueClassFeatures(charClass) {
 export function getVisibileClassFeatures(charClass) {
     return charClass.visibleClassFeatures;
 }
+/**
+ *
+ * @param charClass
+ */
+export function getHigherLevelClassFeatures(charClass) {
+    return charClass.higherLevelClassFeatures;
+}
 /**
  *
  * @param charClass

ddb_main/packages/rules-engine/es/engine/Class/derivers.js

@@ -145,11 +145,14 @@ export function deriveClassFeatureGroups(charClass, classFeatures, appContext) {
         }
         return acc;
     }, []);
+    const higherLevelFeatures = classFeatures.filter((feature) => ClassFeatureAccessors.getRequiredLevel(feature) > getLevel(charClass) &&
+        (appContext === null || !ClassFeatureUtils.getHideInContext(feature, appContext)));
     return {
         activeFeatures,
         visibleFeatures,
         orderedFeatures,
         uniqueFeatures,
+        higherLevelFeatures,
     };
 }
 /**

ddb_main/packages/rules-engine/es/engine/Class/generators.js

@@ -62,11 +62,11 @@ export function generateBaseCharClass(charClass, optionalClassFeatures, allClass
             featureSpells.push(...OptionAccessors.getSpells(option));
         });
     });
-    const { activeFeatures, visibleFeatures, orderedFeatures, uniqueFeatures } = deriveClassFeatureGroups(charClass, updatedFeatures, appContext);
+    const { activeFeatures, visibleFeatures, orderedFeatures, uniqueFeatures, higherLevelFeatures } = deriveClassFeatureGroups(charClass, updatedFeatures, appContext);
     // do any class features or modifiers enable hex, pact or dedicated weapons
     //TODO eventually should just be able to use modifiers here and not have to check class feature names
     const { enablesHexWeapon, enablesPactWeapon, enablesDedicatedWeapon } = deriveDedicatedHexAndPactWeaponEnabled(updatedFeatures, classModifiers);
-    return Object.assign(Object.assign({}, charClass), { activeId: deriveActiveId(charClass), spells: SpellGenerators.updateClassSpells(featureSpells, classSpells), modifiers: classModifiers, featureSpells, classFeatures: updatedFeatures, optionalClassFeatures, activeClassFeatures: activeFeatures, visibleClassFeatures: visibleFeatures, orderedClassFeatures: orderedFeatures, uniqueClassFeatures: uniqueFeatures, feats,
+    return Object.assign(Object.assign({}, charClass), { activeId: deriveActiveId(charClass), spells: SpellGenerators.updateClassSpells(featureSpells, classSpells), modifiers: classModifiers, featureSpells, classFeatures: updatedFeatures, optionalClassFeatures, activeClassFeatures: activeFeatures, visibleClassFeatures: visibleFeatures, orderedClassFeatures: orderedFeatures, uniqueClassFeatures: uniqueFeatures, higherLevelClassFeatures: higherLevelFeatures, feats,
         actions,
         enablesDedicatedWeapon,
         enablesHexWeapon,

ddb_main/packages/rules-engine/es/engine/Spell/derivers.js

@@ -217,7 +217,7 @@ export function getCastLevelRange(spell, spellCasterInfo, ruleData) {
             ...spellCasterInfo.availableSpellLevels,
             ...spellCasterInfo.availablePactMagicLevels,
         ].filter((level) => level >= getLevel(spell));
-        startLevel = Math.max(getLevel(spell), Math.min(...availableLevels));
+        startLevel = Math.max(getLevel(spell), availableLevels.length > 0 ? Math.min(...availableLevels) : 0);
         endLevel = Math.max(getLevel(spell), ...availableLevels);
         if (limitedUse && getDataOriginType(spell) === DataOriginTypeEnum.CLASS_FEATURE) {
             const dataOrigin = getDataOrigin(spell);