diff --git a/apps/api/src/routes/game.ts b/apps/api/src/routes/game.ts
index 9360c70..ff41c3b 100644
--- a/apps/api/src/routes/game.ts
+++ b/apps/api/src/routes/game.ts
@@ -366,13 +366,17 @@ gameRouter.get("/load", async (context) => {
 
   let needsBackfill = false;
 
-  // Backfill combatPower on saves that predate the field
+  // Backfill combatPower and baseCost on saves that predate those fields
   for (const adventurer of state.adventurers) {
+    const defaults = DEFAULT_ADVENTURERS.find((d) => d.id === adventurer.id);
     if (adventurer.combatPower == null) {
-      const defaults = DEFAULT_ADVENTURERS.find((d) => d.id === adventurer.id);
       adventurer.combatPower = defaults?.combatPower ?? 1;
       needsBackfill = true;
     }
+    if (adventurer.baseCost == null) {
+      adventurer.baseCost = defaults?.baseCost ?? 10;
+      needsBackfill = true;
+    }
   }
 
   // Backfill equipment on saves that predate the feature