fix: show spell tier dialog on character sheet cast; duplicate rollTarget to prevent Item mutation

module/documents/actor.mjs

@@ -205,12 +205,33 @@ export default class LethalFantasyActor extends Actor {
       case "spell-power":
       case "miracle-attack":
       case "miracle-power":
-        rollTarget = this.items.find((i) => (i.type === "miracle" || i.type == "spell") && i.id === rollKey)
+        rollTarget = foundry.utils.duplicate(this.items.find((i) => (i.type === "miracle" || i.type == "spell") && i.id === rollKey))
         rollTarget.rollKey = rollKey
         // Read damage tier from combatant currentAction if available
         const activeCombatant = game.combat?.combatants?.find(c => c.actorId === this.id)
         const currentAction = activeCombatant?.getFlag(SYSTEM.id, "currentAction")
-        const damageTier = currentAction?.damageTier || "standard"
+        let damageTier = currentAction?.damageTier
+        // No tier from combat action — prompt the user if multiple tiers exist
+        if (!damageTier) {
+          const tierMap = { standard: "damageDice", overpowered: "damageDiceOverpowered", overpowered2: "damageDiceOverpowered2" }
+          const available = Object.entries(tierMap).filter(([k, v]) => rollTarget.system?.[v])
+          if (available.length > 1) {
+            const buttons = available.map(([id]) => ({
+              action: id,
+              label: id.charAt(0).toUpperCase() + id.slice(1),
+              callback: () => id,
+            }))
+            damageTier = await foundry.applications.api.DialogV2.wait({
+              window: { title: "Choose spell tier" },
+              classes: ["lethalfantasy"],
+              content: `<p>Select the power level for <strong>${rollTarget.name}</strong>:</p>`,
+              buttons,
+              rejectClose: false,
+            }) || "standard"
+          } else {
+            damageTier = "standard"
+          }
+        }
         rollTarget.damageTier = damageTier
         if (rollType === "spell-attack" || rollType === "spell-power") {
           const tierCostMap = { standard: "cost", overpowered: "costOverpowered", overpowered2: "costOverpowered2" }