Prototype Emperor Nexus battle betrayal response

components/game-table.tsx

@@ -2155,6 +2155,14 @@ export function GameTable({
                 using this power. Another faction may play Karama to cancel this
                 use.
               </p>
+              {g.response.kind === 'eliteStrength' &&
+                g.nexusCards &&
+                g.players.some((player) => player.id === g.response?.owner && player.faction === 'emperor') && (
+                  <p className="notice">
+                    Every seat may respond before the Emperor’s Sardaukar strength is locked.
+                    A private Emperor Nexus Betrayal may suppress it without moving starred forces.
+                  </p>
+                )}
               {g.response.kind === 'revivalIncome' &&
                 g.response.amount !== undefined && (
                   <p className="notice">
@@ -2205,8 +2213,10 @@ export function GameTable({
                       : 'Cancel with Karama'}
                   </Button>
                 ))}
-              {g.responseControls?.cancelCards.length &&
-              !g.responseControls.hasPassed ? (
+              {(g.responseControls?.cancelCards.length ||
+                (g.response.kind === 'eliteStrength' && g.nexusCards &&
+                  g.players.some((player) => player.id === g.response?.owner && player.faction === 'emperor'))) &&
+              !g.responseControls?.hasPassed ? (
                 actionButton('Allow this power', { type: 'passResponse' })
               ) : (
                 <p className="muted">

components/nexus-cards.tsx

@@ -145,6 +145,19 @@ export function NexusCards({ game, act, busy }: { game: GameView; act: (action:
           )}
         </div>
       )}
+      {game.nexusEmperorBetrayal && offer.card === 'emperor' && (
+        <div aria-label="Emperor Nexus Betrayal" className="space-y-2">
+          <h4>Emperor Betrayal · Sardaukar</h4>
+          <p className="fine">
+            Spend your Nexus card during this battle response to prevent the Emperor’s
+            Sardaukar strength advantage. Its starred forces remain physical Sardaukar.
+          </p>
+          <Button className="game-action min-h-11 whitespace-normal" disabled={busy}
+            onClick={() => act({ type: 'nexusEmperorBetrayal', event: game.nexusEmperorBetrayal!.event })}>
+            Suppress Sardaukar with Betrayal
+          </Button>
+        </div>
+      )}
       <NexusEmperorSecretAlly game={game} act={act} busy={busy} />
       <NexusFremenRevival game={game} act={act} busy={busy} />
       <div aria-label="Your private Nexus card" className="max-w-xl">