diff --git a/src/controllers/api/getNewRewardSeedController.ts b/src/controllers/api/getNewRewardSeedController.ts
index 4ff82405..cb9e1f82 100644
--- a/src/controllers/api/getNewRewardSeedController.ts
+++ b/src/controllers/api/getNewRewardSeedController.ts
@@ -1,14 +1,12 @@
 import { Inventory } from "@/src/models/inventoryModels/inventoryModel";
 import { generateRewardSeed } from "@/src/services/inventoryService";
 import { getAccountIdForRequest } from "@/src/services/loginService";
-import { logger } from "@/src/utils/logger";
 import { RequestHandler } from "express";
 
 export const getNewRewardSeedController: RequestHandler = async (req, res) => {
     const accountId = await getAccountIdForRequest(req);
 
     const rewardSeed = generateRewardSeed();
-    logger.debug(`generated new reward seed: ${rewardSeed}`);
     await Inventory.updateOne(
         {
             accountOwnerId: accountId
diff --git a/src/models/inventoryModels/inventoryModel.ts b/src/models/inventoryModels/inventoryModel.ts
index a0eddb10..9c737d24 100644
--- a/src/models/inventoryModels/inventoryModel.ts
+++ b/src/models/inventoryModels/inventoryModel.ts
@@ -1213,7 +1213,7 @@ const inventorySchema = new Schema<IInventoryDatabase, InventoryDocumentProps>(
         accountOwnerId: Schema.Types.ObjectId,
         SubscribedToEmails: { type: Number, default: 0 },
         SubscribedToEmailsPersonalized: { type: Number, default: 0 },
-        RewardSeed: Number,
+        RewardSeed: BigInt,
 
         //Credit
         RegularCredits: { type: Number, default: 0 },
diff --git a/src/services/missionInventoryUpdateService.ts b/src/services/missionInventoryUpdateService.ts
index b74c1ddf..f75fa2f4 100644
--- a/src/services/missionInventoryUpdateService.ts
+++ b/src/services/missionInventoryUpdateService.ts
@@ -9,7 +9,7 @@ import {
 } from "warframe-public-export-plus";
 import { IMissionInventoryUpdateRequest, IRewardInfo } from "../types/requestTypes";
 import { logger } from "@/src/utils/logger";
-import { IRngResult, getRandomElement, getRandomReward } from "@/src/services/rngService";
+import { IRngResult, SRng, getRandomElement, getRandomReward } from "@/src/services/rngService";
 import { equipmentKeys, TEquipmentKey } from "@/src/types/inventoryTypes/inventoryTypes";
 import {
     addBooster,
@@ -31,6 +31,7 @@ import {
     addShipDecorations,
     addStanding,
     combineInventoryChanges,
+    generateRewardSeed,
     updateCurrency,
     updateSyndicate
 } from "@/src/services/inventoryService";
@@ -70,7 +71,12 @@ const getRotations = (rotationCount: number, tierOverride: number | undefined):
     return rotatedValues;
 };
 
-const getRandomRewardByChance = (pool: IReward[]): IRngResult | undefined => {
+const getRandomRewardByChance = (pool: IReward[], rng?: SRng): IRngResult | undefined => {
+    if (rng) {
+        const res = rng.randomReward(pool as IRngResult[]);
+        rng.randomFloat(); // something related to rewards multiplier
+        return res;
+    }
     return getRandomReward(pool as IRngResult[]);
 };
 
@@ -548,6 +554,11 @@ export const addMissionRewards = async (
         return { MissionRewards: [] };
     }
 
+    if (rewardInfo.rewardSeed) {
+        // We're using a reward seed, so give the client a new one in the response.
+        inventory.RewardSeed = generateRewardSeed();
+    }
+
     //TODO: check double reward merging
     const MissionRewards: IMissionReward[] = getRandomMissionDrops(rewardInfo, wagerTier);
     logger.debug("random mission drops:", MissionRewards);
@@ -1062,6 +1073,7 @@ function getRandomMissionDrops(RewardInfo: IRewardInfo, tierOverride: number | u
         if (rewardManifests.length != 0) {
             logger.debug(`generating random mission rewards`, { rewardManifests, rotations });
         }
+        const rng = new SRng(BigInt(RewardInfo.rewardSeed ?? generateRewardSeed()) ^ 0xffffffffffffffffn);
         rewardManifests.forEach(name => {
             const table = ExportRewards[name];
             if (!table) {
@@ -1070,7 +1082,7 @@ function getRandomMissionDrops(RewardInfo: IRewardInfo, tierOverride: number | u
             }
             for (const rotation of rotations) {
                 const rotationRewards = table[rotation];
-                const drop = getRandomRewardByChance(rotationRewards);
+                const drop = getRandomRewardByChance(rotationRewards, rng);
                 if (drop) {
                     drops.push({ StoreItem: drop.type, ItemCount: drop.itemCount });
                 }
diff --git a/src/services/rngService.ts b/src/services/rngService.ts
index 983977ce..f88b23c0 100644
--- a/src/services/rngService.ts
+++ b/src/services/rngService.ts
@@ -31,7 +31,7 @@ const getRewardAtPercentage = <T extends { probability: number }>(pool: T[], per
             return item;
         }
     }
-    throw new Error("What the fuck?");
+    return pool[pool.length - 1];
 };
 
 export const getRandomReward = <T extends { probability: number }>(pool: T[]): T | undefined => {
@@ -142,4 +142,8 @@ export class SRng {
         this.state = (0x5851f42d4c957f2dn * this.state + 0x14057b7ef767814fn) & 0xffffffffffffffffn;
         return (Number(this.state >> 38n) & 0xffffff) * 0.000000059604645;
     }
+
+    randomReward<T extends { probability: number }>(pool: T[]): T | undefined {
+        return getRewardAtPercentage(pool, this.randomFloat());
+    }
 }
diff --git a/src/types/inventoryTypes/inventoryTypes.ts b/src/types/inventoryTypes/inventoryTypes.ts
index 1146bef6..63207ef0 100644
--- a/src/types/inventoryTypes/inventoryTypes.ts
+++ b/src/types/inventoryTypes/inventoryTypes.ts
@@ -194,7 +194,7 @@ export interface IInventoryClient extends IDailyAffiliations, InventoryClientEqu
     Mailbox?: IMailboxClient;
     SubscribedToEmails: number;
     Created: IMongoDate;
-    RewardSeed: number;
+    RewardSeed: number | bigint;
     RegularCredits: number;
     PremiumCredits: number;
     PremiumCreditsFree: number;
diff --git a/src/types/requestTypes.ts b/src/types/requestTypes.ts
index 494e23f4..fff164a8 100644
--- a/src/types/requestTypes.ts
+++ b/src/types/requestTypes.ts
@@ -141,7 +141,7 @@ export interface IRewardInfo {
     EOM_AFK?: number;
     rewardQualifications?: string; // did a Survival for 5 minutes and this was "1"
     PurgatoryRewardQualifications?: string;
-    rewardSeed?: number;
+    rewardSeed?: number | bigint;
     periodicMissionTag?: string;
 
     // for bounties, only EOM_AFK and node are given from above, plus: