Update D30 descriptions and add simple shield option for NPCs

lethal-fantasy.mjs

@@ -524,6 +524,7 @@ Hooks.on("createChatMessage", async (message) => {
     const shieldData = LethalFantasyUtils.getShieldReactionData(defender)
     let canRerollDefense = LethalFantasyUtils.hasD30Reroll(defenseD30message)
     let canShieldReact = !!shieldData
+    let canAdHocShield = !shieldData
 
     while (defenseRoll < attackRoll) {
       const currentGrit = Number(defender.system?.grit?.current) || 0
@@ -571,6 +572,14 @@ Hooks.on("createChatMessage", async (message) => {
           icon: "fa-solid fa-shield",
           callback: () => "shieldReact"
         })
+      } else if (canAdHocShield) {
+        // No pre-configured shield — offer ad-hoc shield option (useful for monsters)
+        buttons.push({
+          action: "adHocShield",
+          label: "Roll ad-hoc shield (choose dice + DR)",
+          icon: "fa-solid fa-shield-halved",
+          callback: () => "adHocShield"
+        })
       }
 
       buttons.push({
@@ -640,7 +649,6 @@ Hooks.on("createChatMessage", async (message) => {
         canShieldReact = false
 
         if (newDefenseTotal >= attackRoll) {
-          // Shield roll tied or exceeded the attack — shield blocked
           shieldBlocked = true
           shieldReaction = {
             damageReduction: shieldData.damageReduction,
@@ -652,7 +660,6 @@ Hooks.on("createChatMessage", async (message) => {
             `<p><strong>${defenderName}</strong> rolls <strong>${shieldData.label}</strong> and adds <strong>${shieldBonus}</strong> to defense (${newDefenseTotal} ≥ ${attackRoll}). <strong>Shield blocked the attack!</strong> Both armor DR and shield DR <strong>${shieldData.damageReduction}</strong> will apply to damage.</p>`
           )
         } else {
-          // Shield roll not enough — hit still lands, armor DR only
           shieldReaction = null
           await createReactionMessage(
             defender,
@@ -660,6 +667,35 @@ Hooks.on("createChatMessage", async (message) => {
           )
         }
       }
+
+      if (choice === "adHocShield") {
+        const adHoc = await LethalFantasyUtils.promptAdHocShield(defenderName, attackRoll, defenseRoll)
+        if (!adHoc) continue
+        const shieldBonus = await LethalFantasyUtils.rollBonusDie(adHoc.formula, defender)
+        const newDefenseTotal = defenseRoll + shieldBonus
+        defenseRoll = newDefenseTotal
+        canShieldReact = false
+        canAdHocShield = false
+
+        if (newDefenseTotal >= attackRoll) {
+          shieldBlocked = true
+          shieldReaction = {
+            damageReduction: adHoc.damageReduction,
+            label: `${adHoc.formula.toUpperCase()} shield`,
+            bonus: shieldBonus
+          }
+          await createReactionMessage(
+            defender,
+            `<p><strong>${defenderName}</strong> rolls <strong>${adHoc.formula.toUpperCase()}</strong> shield and adds <strong>${shieldBonus}</strong> to defense (${newDefenseTotal} ≥ ${attackRoll}). <strong>Shield blocked the attack!</strong> Both armor DR and shield DR <strong>${adHoc.damageReduction}</strong> will apply to damage.</p>`
+          )
+        } else {
+          shieldReaction = null
+          await createReactionMessage(
+            defender,
+            `<p><strong>${defenderName}</strong> rolls <strong>${adHoc.formula.toUpperCase()}</strong> shield and adds <strong>${shieldBonus}</strong> to defense (${newDefenseTotal} < ${attackRoll}). Shield did not block — normal hit, armor DR only.</p>`
+          )
+        }
+      }
     }
   }