diff --git a/module/data/actor/character.mjs b/module/data/actor/character.mjs
index ff6af4dc99..1d3d222a17 100644
--- a/module/data/actor/character.mjs
+++ b/module/data/actor/character.mjs
@@ -113,6 +113,7 @@ export default class CharacterData extends CreatureTemplate {
           })
         }, { label: "DND5E.HitPoints" }),
         death: new RollConfigField({
+          ability: false,
           success: new NumberField({
             required: true, nullable: false, integer: true, min: 0, initial: 0, label: "DND5E.DeathSaveSuccesses"
           }),
diff --git a/module/data/actor/npc.mjs b/module/data/actor/npc.mjs
index 901d621312..93f36bc28d 100644
--- a/module/data/actor/npc.mjs
+++ b/module/data/actor/npc.mjs
@@ -104,6 +104,7 @@ export default class NPCData extends CreatureTemplate {
           formula: new FormulaField({required: true, label: "DND5E.HPFormula"})
         }, {label: "DND5E.HitPoints"}),
         death: new RollConfigField({
+          ability: false,
           success: new NumberField({
             required: true, nullable: false, integer: true, min: 0, initial: 0, label: "DND5E.DeathSaveSuccesses"
           }),
diff --git a/module/data/actor/templates/attributes.mjs b/module/data/actor/templates/attributes.mjs
index 87a407ef76..ff38e81be4 100644
--- a/module/data/actor/templates/attributes.mjs
+++ b/module/data/actor/templates/attributes.mjs
@@ -144,7 +144,7 @@ export default class AttributesFields {
     const abilityId = concentration.ability || CONFIG.DND5E.defaultAbilities.concentration;
     const ability = this.abilities?.[abilityId] || {};
     const bonus = simplifyBonus(concentration.bonuses.save, rollData);
-    concentration.save = (ability.save ?? 0) + bonus;
+    concentration.save = (ability.save?.value ?? 0) + bonus;
   }
 
   /* -------------------------------------------- */
diff --git a/module/data/actor/templates/common.mjs b/module/data/actor/templates/common.mjs
index aadf7fb745..bdf85f4add 100644
--- a/module/data/actor/templates/common.mjs
+++ b/module/data/actor/templates/common.mjs
@@ -4,6 +4,7 @@ import { ActorDataModel } from "../../abstract.mjs";
 import FormulaField from "../../fields/formula-field.mjs";
 import MappingField from "../../fields/mapping-field.mjs";
 import CurrencyTemplate from "../../shared/currency.mjs";
+import RollConfigField from "../../shared/roll-config-field.mjs";
 
 const { NumberField, SchemaField } = foundry.data.fields;
 
@@ -15,6 +16,16 @@ const { NumberField, SchemaField } = foundry.data.fields;
  * @property {object} bonuses        Bonuses that modify ability checks and saves.
  * @property {string} bonuses.check  Numeric or dice bonus to ability checks.
  * @property {string} bonuses.save   Numeric or dice bonus to ability saving throws.
+ * @property {object} check          Properties related to ability checks.
+ * @property {object} check.roll
+ * @property {number} check.roll.mode   The advantage mode of ability checks.
+ * @property {number} check.roll.min    The minimum that can be rolled on the d20.
+ * @property {number} check.roll.max    The maximum that can be rolled on the d20.
+ * @property {object} save              Properties related to ability saving throws.
+ * @property {object} save.roll
+ * @property {number} save.roll.mode    The advantage mode of ability saving throws.
+ * @property {number} save.roll.min     The minimum that can be rolled on the d20.
+ * @property {number} save.roll.max     The maximum that can be rolled on the d20.
  */
 
 /**
@@ -41,7 +52,10 @@ export default class CommonTemplate extends ActorDataModel.mixin(CurrencyTemplat
         bonuses: new SchemaField({
           check: new FormulaField({ required: true, label: "DND5E.AbilityCheckBonus" }),
           save: new FormulaField({ required: true, label: "DND5E.SaveBonus" })
-        }, { label: "DND5E.AbilityBonuses" })
+        }, { label: "DND5E.AbilityBonuses" }),
+        save: new RollConfigField({
+          ability: false
+        })
       }), {
         initialKeys: CONFIG.DND5E.abilities, initialValue: this._initialAbilityValue.bind(this),
         initialKeysOnly: true, label: "DND5E.Abilities"
@@ -147,14 +161,22 @@ export default class CommonTemplate extends ActorDataModel.mixin(CurrencyTemplat
       const checkBonusAbl = simplifyBonus(abl.bonuses?.check, rollData);
       abl.checkBonus = checkBonusAbl + checkBonus;
 
-      abl.save = abl.mod + abl.saveBonus;
-      if ( Number.isNumeric(abl.saveProf.term) ) abl.save += abl.saveProf.flat;
+      abl.save.value = abl.mod + abl.saveBonus;
+      if ( Number.isNumeric(abl.saveProf.term) ) abl.save.value += abl.saveProf.flat;
       abl.dc = 8 + abl.mod + prof + dcBonus;
 
       if ( !Number.isFinite(abl.max) ) abl.max = CONFIG.DND5E.maxAbilityScore;
 
       // If we merged saves when transforming, take the highest bonus here.
-      if ( originalSaves && abl.proficient ) abl.save = Math.max(abl.save, originalSaves[id].save);
+      if ( originalSaves && abl.proficient ) abl.save.value = Math.max(abl.save, originalSaves[id].save.value);
+
+      // Deprecations.
+      abl.save.toString = function() {
+        foundry.utils.logCompatibilityWarning("The 'abilities.<ability>.save' property is now stored in 'abilities.<ability>.save.value'.", {
+          since: "4.2", until: "4.5"
+        });
+        return abl.save.value;
+      };
     }
   }
 
diff --git a/module/data/shared/roll-config-field.mjs b/module/data/shared/roll-config-field.mjs
index 6d9a699c99..0c6db7c399 100644
--- a/module/data/shared/roll-config-field.mjs
+++ b/module/data/shared/roll-config-field.mjs
@@ -4,7 +4,7 @@ const { StringField, NumberField, SchemaField } = foundry.data.fields;
 
 /**
  * @typedef {object} RollConfigData
- * @property {string} ability   Default ability associated with this roll.
+ * @property {string} [ability]  Default ability associated with this roll.
  * @property {object} roll
  * @property {number} roll.min   Minimum number on the die rolled.
  * @property {number} roll.max   Maximum number on the die rolled.
@@ -18,7 +18,6 @@ export default class RollConfigField extends foundry.data.fields.SchemaField {
   constructor({roll={}, ability="", ...fields}={}, options={}) {
     const opts = { initial: null, nullable: true, min: 1, max: 20, integer: true };
     fields = {
-      ability: new StringField({required: true, initial: ability, label: "DND5E.AbilityModifier"}),
       roll: new SchemaField({
         min: new NumberField({...opts, label: "DND5E.ROLL.Range.Minimum"}),
         max: new NumberField({...opts, label: "DND5E.ROLL.Range.Maximum"}),
@@ -27,6 +26,13 @@ export default class RollConfigField extends foundry.data.fields.SchemaField {
       }),
       ...fields
     };
+    if ( ability !== false ) {
+      fields.ability = new StringField({
+        required: true,
+        initial: ability,
+        label: "DND5E.AbilityModifier"
+      });
+    }
     super(fields, options);
   }
 }
diff --git a/templates/actors/character-sheet.hbs b/templates/actors/character-sheet.hbs
index d62df29939..c1d807ed2a 100644
--- a/templates/actors/character-sheet.hbs
+++ b/templates/actors/character-sheet.hbs
@@ -171,7 +171,7 @@
                             {{{ability.icon}}}
                         </a>
                         <span class="ability-save" data-tooltip="DND5E.SavingThrow">
-                            {{numberFormat ability.save decimals=0 sign=true}}
+                            {{numberFormat ability.save.value decimals=0 sign=true}}
                         </span>
                     </div>
                     <a class="config-button" data-action="ability"
diff --git a/templates/actors/npc-sheet-2.hbs b/templates/actors/npc-sheet-2.hbs
index de9fdf1e0f..0d1426ff79 100644
--- a/templates/actors/npc-sheet-2.hbs
+++ b/templates/actors/npc-sheet-2.hbs
@@ -297,7 +297,7 @@
                                            data-tooltip="{{ hover }}" aria-label="{{ localize hover }}"
                                            value="{{#if @root.editable}}{{ baseProf }}{{else}}{{ proficient }}{{/if}}"
                                            {{ disabled (not @root.editable) }}></proficiency-cycle>
-                        <span class="save">{{ dnd5e-formatModifier save }}</span>
+                        <span class="save">{{ dnd5e-formatModifier save.value }}</span>
                         <i class="fas fa-shield-heart" inert></i>
                     </div>
                 </div>
diff --git a/templates/actors/npc-sheet.hbs b/templates/actors/npc-sheet.hbs
index 6e4435380b..8987ecb762 100644
--- a/templates/actors/npc-sheet.hbs
+++ b/templates/actors/npc-sheet.hbs
@@ -143,7 +143,7 @@
                             {{{ability.icon}}}
                         </a>
                         <span class="ability-save" data-tooltip="DND5E.SavingThrow">
-                            {{numberFormat ability.save decimals=0 sign=true}}
+                            {{numberFormat ability.save.value decimals=0 sign=true}}
                         </span>
                     </div>
                     <a class="config-button" data-action="ability"
diff --git a/templates/actors/tabs/character-details.hbs b/templates/actors/tabs/character-details.hbs
index fb31b4810e..c654ee4d1e 100644
--- a/templates/actors/tabs/character-details.hbs
+++ b/templates/actors/tabs/character-details.hbs
@@ -34,7 +34,7 @@
         {{/if}}
         <a class="name saving-throw full {{ @root.rollableClass }}">{{ label }}</a>
         <a class="name saving-throw abbr {{ @root.rollableClass }}">{{ abbr }}</a>
-        <div class="bonus">{{ dnd5e-formatModifier save }}</div>
+        <div class="bonus">{{ dnd5e-formatModifier save.value }}</div>
         {{#if @root.editable}}
         <a class="config-button" data-action="ability" data-tooltip="{{ config }}" aria-label="{{ localize config }}">
             <i class="fas fa-cog"></i>