Resolve prior leaders in Advanced battle explosions

game/engine.ts

@@ -31336,6 +31336,21 @@ function resolveBattle(g: Game, retreat?: DiplomatRetreatSelection) {
     observeOccupation(g);
     dead(al);
     dead(dl);
+    // Surviving discs from earlier battles remain in their Arrakis territory
+    // through the Battle phase. Captives have changed custody and do not use
+    // their old battle-location stamp as proof of physical presence.
+    if (g.advanced && !b.territory.startsWith('homeworld:')) {
+      let previousLeaders = 0;
+      for (const owner of g.players)
+        for (const leader of owner.leaders)
+          if (!leader.dead && !leader.capturedBy && !leader.concealed &&
+              leader.usedAt === b.territory) {
+            dead(leader);
+            previousLeaders++;
+          }
+      if (previousLeaders)
+        log(g, `${previousLeaders} surviving leader disc${previousLeaders === 1 ? '' : 's'} from earlier battles in this territory ${previousLeaders === 1 ? 'was' : 'were'} also killed by the explosion.`);
+    }
     for (const [p, plan] of [
       [a, ap],
       [d, dp],

game/reference.ts

@@ -2815,6 +2815,7 @@ export const RULE_TOPICS: RuleTopic[] = [
     steps: [
       'Choose one weapon, one defense, both, or neither. A worthless card can occupy a weapon or defense slot.',
       'Choose an available leader or Cheap Hero when required. Without either, battle cards cannot be played. In Advanced, sealing a legal leaderless plan announces that fact to the whole table before reveal; its dial, spice and other choices remain sealed. Refresh retains the same announcement without submitting another plan.',
+      'In Advanced on Arrakis, a surviving leader remains in its battle territory for the rest of the Battle phase. A later Lasgun–Shield explosion there also kills previously surviving leader discs still present, even if a different leader fights that later battle. A successful Traitor call prevents the explosion.',
       'A loser normally discards all played cards. If allied with Moritani and the battle has a winner, the defeated ally may retain one played card that a winner could keep. A winner may discard selected played cards; Cheap Heroes are discarded after use.',
     ],
     related: ['battle', 'card-karama', 'moritani-ally-retention'],