diff --git a/module/applications/attack-roll-dialog.mjs b/module/applications/attack-roll-dialog.mjs
index 96ea1ef..0017e24 100644
--- a/module/applications/attack-roll-dialog.mjs
+++ b/module/applications/attack-roll-dialog.mjs
@@ -25,6 +25,7 @@ export default class AttackRollDialog extends VagabondRollDialog {
 
     this.weaponId = options.weaponId || null;
     this.twoHanded = false;
+    this.critThresholdModifier = 0; // Relative adjustment to base crit threshold
 
     // Auto-select first equipped weapon if none specified, otherwise default to unarmed
     if (!this.weaponId) {
@@ -154,10 +155,17 @@ export default class AttackRollDialog extends VagabondRollDialog {
     // Attacks use trained difficulty (20 - stat × 2)
     const difficulty = 20 - statValue * 2;
 
-    // Get crit threshold from actor's attack data or weapon override
+    // Get base crit threshold from actor's attack data or weapon override
     const actorCritThreshold = this.actor.system.attacks?.[attackType]?.critThreshold || 20;
     const weaponCritThreshold = weapon.system.critThreshold;
-    const critThreshold = weaponCritThreshold ?? actorCritThreshold;
+    const baseCritThreshold = weaponCritThreshold ?? actorCritThreshold;
+
+    // Calculate effective crit threshold with modifier, clamped to 1-20
+    const effectiveCritThreshold = Math.clamp(
+      baseCritThreshold + this.critThresholdModifier,
+      1,
+      20
+    );
 
     return {
       attackType,
@@ -166,7 +174,9 @@ export default class AttackRollDialog extends VagabondRollDialog {
       statLabel: game.i18n.localize(CONFIG.VAGABOND?.stats?.[statKey] || statKey),
       statValue,
       difficulty,
-      critThreshold,
+      baseCritThreshold,
+      effectiveCritThreshold,
+      critThresholdModifier: this.critThresholdModifier,
     };
   }
 
@@ -279,7 +289,9 @@ export default class AttackRollDialog extends VagabondRollDialog {
       context.statLabel = attackData.statLabel;
       context.statValue = attackData.statValue;
       context.difficulty = attackData.difficulty;
-      context.critThreshold = attackData.critThreshold;
+      context.baseCritThreshold = attackData.baseCritThreshold;
+      context.effectiveCritThreshold = attackData.effectiveCritThreshold;
+      context.critThresholdModifier = attackData.critThresholdModifier;
     }
 
     // Versatile weapon handling
@@ -316,6 +328,7 @@ export default class AttackRollDialog extends VagabondRollDialog {
     weaponSelect?.addEventListener("change", (event) => {
       this.weaponId = event.target.value;
       this.twoHanded = false; // Reset two-handed when changing weapon
+      this.critThresholdModifier = 0; // Reset crit modifier when changing weapon
       this.render();
     });
 
@@ -325,6 +338,30 @@ export default class AttackRollDialog extends VagabondRollDialog {
       this.twoHanded = event.target.checked;
       this.render();
     });
+
+    // Crit threshold stepper buttons
+    const critIncrement = this.element.querySelector('[data-action="crit-increment"]');
+    const critDecrement = this.element.querySelector('[data-action="crit-decrement"]');
+
+    critIncrement?.addEventListener("click", () => {
+      const attackData = this.attackData;
+      if (!attackData) return;
+      const newEffective = attackData.effectiveCritThreshold + 1;
+      if (newEffective <= 20) {
+        this.critThresholdModifier++;
+        this.render();
+      }
+    });
+
+    critDecrement?.addEventListener("click", () => {
+      const attackData = this.attackData;
+      if (!attackData) return;
+      const newEffective = attackData.effectiveCritThreshold - 1;
+      if (newEffective >= 1) {
+        this.critThresholdModifier--;
+        this.render();
+      }
+    });
   }
 
   /** @override */
@@ -335,10 +372,15 @@ export default class AttackRollDialog extends VagabondRollDialog {
       return;
     }
 
+    // Get effective crit threshold from attack data
+    const attackData = this.attackData;
+    const effectiveCritThreshold = attackData?.effectiveCritThreshold ?? 20;
+
     // Perform the attack check
     const result = await attackCheck(this.actor, weapon, {
       favorHinder: this.netFavorHinder,
       modifier: this.rollConfig.modifier,
+      critThreshold: effectiveCritThreshold,
     });
 
     // Send to chat (damage is rolled separately via button click)
diff --git a/module/applications/spell-cast-dialog.mjs b/module/applications/spell-cast-dialog.mjs
index a480c9a..3da1f20 100644
--- a/module/applications/spell-cast-dialog.mjs
+++ b/module/applications/spell-cast-dialog.mjs
@@ -25,6 +25,7 @@ export default class SpellCastDialog extends VagabondRollDialog {
     super(actor, options);
 
     this.spellId = options.spellId || null;
+    this.critThresholdModifier = 0; // Relative adjustment to base crit threshold
 
     // Casting configuration
     this.castConfig = {
@@ -275,7 +276,17 @@ export default class SpellCastDialog extends VagabondRollDialog {
       context.statValue = statValue;
       context.trained = trained;
       context.difficulty = trained ? 20 - statValue * 2 : 20 - statValue;
-      context.critThreshold = skillData?.critThreshold || 20;
+
+      // Calculate base and effective crit threshold
+      const baseCritThreshold = skillData?.critThreshold || 20;
+      const effectiveCritThreshold = Math.clamp(
+        baseCritThreshold + this.critThresholdModifier,
+        1,
+        20
+      );
+      context.baseCritThreshold = baseCritThreshold;
+      context.effectiveCritThreshold = effectiveCritThreshold;
+      context.critThresholdModifier = this.critThresholdModifier;
 
       // Damage configuration
       context.isDamaging = spell.system.isDamaging();
@@ -347,6 +358,7 @@ export default class SpellCastDialog extends VagabondRollDialog {
     spellSelect?.addEventListener("change", (event) => {
       this.spellId = event.target.value;
       this._initializeCastConfig();
+      this.critThresholdModifier = 0; // Reset crit modifier when changing spell
       this.render();
     });
 
@@ -378,6 +390,40 @@ export default class SpellCastDialog extends VagabondRollDialog {
       this.render();
     });
 
+    // Crit threshold stepper buttons
+    const critIncrement = this.element.querySelector('[data-action="crit-increment"]');
+    const critDecrement = this.element.querySelector('[data-action="crit-decrement"]');
+
+    critIncrement?.addEventListener("click", () => {
+      const castingSkill = this._getCastingSkill();
+      const skillData = this.actor.system.skills?.[castingSkill];
+      const baseCritThreshold = skillData?.critThreshold || 20;
+      const effectiveCritThreshold = Math.clamp(
+        baseCritThreshold + this.critThresholdModifier,
+        1,
+        20
+      );
+      if (effectiveCritThreshold < 20) {
+        this.critThresholdModifier++;
+        this.render();
+      }
+    });
+
+    critDecrement?.addEventListener("click", () => {
+      const castingSkill = this._getCastingSkill();
+      const skillData = this.actor.system.skills?.[castingSkill];
+      const baseCritThreshold = skillData?.critThreshold || 20;
+      const effectiveCritThreshold = Math.clamp(
+        baseCritThreshold + this.critThresholdModifier,
+        1,
+        20
+      );
+      if (effectiveCritThreshold > 1) {
+        this.critThresholdModifier--;
+        this.render();
+      }
+    });
+
     // Note: Favor/hinder toggles and modifier presets are handled by parent class
     // via super._onRender() - no need to add duplicate listeners here
   }
@@ -410,11 +456,18 @@ export default class SpellCastDialog extends VagabondRollDialog {
     const statValue = this.actor.system.stats?.[statKey]?.value || 0;
     const trained = skillData?.trained || false;
     const difficulty = trained ? 20 - statValue * 2 : 20 - statValue;
-    const critThreshold = skillData?.critThreshold || 20;
+
+    // Calculate effective crit threshold with modifier
+    const baseCritThreshold = skillData?.critThreshold || 20;
+    const effectiveCritThreshold = Math.clamp(
+      baseCritThreshold + this.critThresholdModifier,
+      1,
+      20
+    );
 
     const result = await skillCheck(this.actor, castingSkill, {
       difficulty,
-      critThreshold,
+      critThreshold: effectiveCritThreshold,
       favorHinder: this.netFavorHinder,
       modifier: this.rollConfig.modifier,
     });
diff --git a/module/dice/rolls.mjs b/module/dice/rolls.mjs
index 63c4f1c..df797f1 100644
--- a/module/dice/rolls.mjs
+++ b/module/dice/rolls.mjs
@@ -159,6 +159,7 @@ export async function skillCheck(actor, skillId, options = {}) {
  * @param {Object} options - Additional options
  * @param {number} [options.modifier=0] - Situational modifier
  * @param {number} [options.favorHinder] - Override favor/hinder
+ * @param {number} [options.critThreshold] - Override crit threshold
  * @returns {Promise<VagabondRollResult>} The roll result
  */
 export async function attackCheck(actor, weapon, options = {}) {
@@ -178,10 +179,11 @@ export async function attackCheck(actor, weapon, options = {}) {
   // Attack difficulty = 20 - stat × 2 (attacks are always "trained")
   const difficulty = 20 - statValue * 2;
 
-  // Get crit threshold: weapon override > actor attack data > default
+  // Get crit threshold: option override > weapon override > actor attack data > default
   const actorCritThreshold = system.attacks?.[attackType]?.critThreshold || 20;
   const weaponCritThreshold = weapon.system.critThreshold;
-  const critThreshold = weaponCritThreshold ?? actorCritThreshold;
+  const baseCritThreshold = weaponCritThreshold ?? actorCritThreshold;
+  const critThreshold = options.critThreshold ?? baseCritThreshold;
 
   // Determine favor/hinder from Active Effect flags or override
   const favorHinderResult = actor.getNetFavorHinder?.({ isAttack: true }) ?? { net: 0 };
diff --git a/styles/scss/dialogs/_roll-dialog.scss b/styles/scss/dialogs/_roll-dialog.scss
index 8ab10c9..2febfc2 100644
--- a/styles/scss/dialogs/_roll-dialog.scss
+++ b/styles/scss/dialogs/_roll-dialog.scss
@@ -134,6 +134,85 @@
     }
   }
 
+  // Crit Threshold Stepper Control
+  .crit-threshold-section {
+    @include flex-center;
+    flex-wrap: wrap;
+    gap: $spacing-2;
+    padding: $spacing-2 $spacing-3;
+    background-color: var(--color-bg-secondary);
+    border-radius: $radius-md;
+
+    > .label {
+      font-size: $font-size-sm;
+      color: var(--color-text-muted);
+    }
+
+    .crit-stepper {
+      @include flex-center;
+      gap: $spacing-1;
+
+      .stepper-btn {
+        @include flex-center;
+        width: 1.75rem;
+        height: 1.75rem;
+        padding: 0;
+        border: 1px solid var(--color-border);
+        border-radius: $radius-sm;
+        background-color: var(--color-bg-primary);
+        color: var(--color-text-secondary);
+        cursor: pointer;
+        transition: all $transition-fast;
+
+        i {
+          font-size: $font-size-xs;
+        }
+
+        &:hover:not(:disabled) {
+          background-color: var(--color-bg-tertiary);
+          border-color: var(--color-accent-primary);
+          color: var(--color-accent-primary);
+        }
+
+        &:disabled {
+          opacity: 0.4;
+          cursor: not-allowed;
+        }
+
+        &.decrement:hover:not(:disabled) {
+          border-color: var(--color-success);
+          color: var(--color-success);
+        }
+
+        &.increment:hover:not(:disabled) {
+          border-color: var(--color-danger);
+          color: var(--color-danger);
+        }
+      }
+
+      .crit-value {
+        min-width: 2.5rem;
+        text-align: center;
+        font-family: $font-family-mono;
+        font-size: $font-size-base;
+        font-weight: $font-weight-bold;
+        color: var(--color-text-primary);
+
+        &.modified {
+          color: var(--color-warning);
+        }
+      }
+    }
+
+    .crit-modifier-indicator {
+      width: 100%;
+      text-align: center;
+      font-size: $font-size-xs;
+      color: var(--color-text-muted);
+      font-style: italic;
+    }
+  }
+
   // Single-column info (for spell dialog)
   .spell-info {
     @include flex-column;
diff --git a/templates/dialog/attack-roll.hbs b/templates/dialog/attack-roll.hbs
index 379723d..105fab1 100644
--- a/templates/dialog/attack-roll.hbs
+++ b/templates/dialog/attack-roll.hbs
@@ -43,12 +43,25 @@
       <span class="label">{{localize "VAGABOND.Difficulty"}}:</span>
       <span class="value difficulty">{{rollSpecific.difficulty}}</span>
     </div>
-    {{#if (lt rollSpecific.critThreshold 20)}}
-    <div class="attack-crit">
+
+    {{!-- Crit Threshold Stepper --}}
+    <div class="crit-threshold-section">
       <span class="label">{{localize "VAGABOND.CritThreshold"}}:</span>
-      <span class="value crit">{{rollSpecific.critThreshold}}+</span>
+      <div class="crit-stepper">
+        <button type="button" class="stepper-btn decrement" data-action="crit-decrement" {{#if (eq rollSpecific.effectiveCritThreshold 1)}}disabled{{/if}}>
+          <i class="fa-solid fa-minus"></i>
+        </button>
+        <span class="crit-value {{#if (lt rollSpecific.effectiveCritThreshold 20)}}modified{{/if}}">{{rollSpecific.effectiveCritThreshold}}+</span>
+        <button type="button" class="stepper-btn increment" data-action="crit-increment" {{#if (eq rollSpecific.effectiveCritThreshold 20)}}disabled{{/if}}>
+          <i class="fa-solid fa-plus"></i>
+        </button>
+      </div>
+      {{#if rollSpecific.critThresholdModifier}}
+      <div class="crit-modifier-indicator">
+        ({{#if (lt rollSpecific.critThresholdModifier 0)}}{{rollSpecific.critThresholdModifier}}{{else}}+{{rollSpecific.critThresholdModifier}}{{/if}} from base {{rollSpecific.baseCritThreshold}})
+      </div>
+      {{/if}}
     </div>
-    {{/if}}
   </div>
 
   {{!-- Damage Preview --}}
diff --git a/templates/dialog/spell-cast.hbs b/templates/dialog/spell-cast.hbs
index 8cb549f..10e0853 100644
--- a/templates/dialog/spell-cast.hbs
+++ b/templates/dialog/spell-cast.hbs
@@ -67,12 +67,25 @@
       <span class="label">{{localize "VAGABOND.Difficulty"}}:</span>
       <span class="value difficulty">{{rollSpecific.difficulty}}</span>
     </div>
-    {{#if (lt rollSpecific.critThreshold 20)}}
-    <div class="casting-crit">
+
+    {{!-- Crit Threshold Stepper --}}
+    <div class="crit-threshold-section">
       <span class="label">{{localize "VAGABOND.CritThreshold"}}:</span>
-      <span class="value crit">{{rollSpecific.critThreshold}}+</span>
+      <div class="crit-stepper">
+        <button type="button" class="stepper-btn decrement" data-action="crit-decrement" {{#if (eq rollSpecific.effectiveCritThreshold 1)}}disabled{{/if}}>
+          <i class="fa-solid fa-minus"></i>
+        </button>
+        <span class="crit-value {{#if (lt rollSpecific.effectiveCritThreshold 20)}}modified{{/if}}">{{rollSpecific.effectiveCritThreshold}}+</span>
+        <button type="button" class="stepper-btn increment" data-action="crit-increment" {{#if (eq rollSpecific.effectiveCritThreshold 20)}}disabled{{/if}}>
+          <i class="fa-solid fa-plus"></i>
+        </button>
+      </div>
+      {{#if rollSpecific.critThresholdModifier}}
+      <div class="crit-modifier-indicator">
+        ({{#if (lt rollSpecific.critThresholdModifier 0)}}{{rollSpecific.critThresholdModifier}}{{else}}+{{rollSpecific.critThresholdModifier}}{{/if}} from base {{rollSpecific.baseCritThreshold}})
+      </div>
+      {{/if}}
     </div>
-    {{/if}}
   </div>
 
   {{!-- Effect Description and Toggle --}}