diff --git a/README.md b/README.md
index dc57e796..0bd7de22 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@ SpaceNinjaServer requires a `config.json`. To set it up, you can copy the [confi
 - `myIrcAddresses` can be used to point to an IRC server. If not provided, defaults to `[ myAddress ]`.
 - `worldState.eidolonOverride` can be set to `day` or `night` to lock the time to day/fass and night/vome on Plains of Eidolon/Cambion Drift.
 - `worldState.vallisOverride` can be set to `warm` or `cold` to lock the temperature on Orb Vallis.
+- `worldState.duviriOverride` can be set to `joy`, `anger`, `envy`, `sorrow`, or `fear` to lock the Duviri spiral.
 - `worldState.nightwaveOverride` will lock the nightwave season, assuming the client is new enough for it. Valid values:
   - `RadioLegionIntermission13Syndicate` for Nora's Mix Vol. 9
   - `RadioLegionIntermission12Syndicate` for Nora's Mix Vol. 8
diff --git a/config.json.example b/config.json.example
index 8f839751..4c5fafb5 100644
--- a/config.json.example
+++ b/config.json.example
@@ -58,6 +58,7 @@
     "starDays": true,
     "eidolonOverride": "",
     "vallisOverride": "",
+    "duviriOverride": "",
     "nightwaveOverride": "",
     "circuitGameModes": null
   },
diff --git a/src/services/configService.ts b/src/services/configService.ts
index 0c09eb23..a45645a2 100644
--- a/src/services/configService.ts
+++ b/src/services/configService.ts
@@ -64,6 +64,7 @@ export interface IConfig {
         starDays?: boolean;
         eidolonOverride?: string;
         vallisOverride?: string;
+        duviriOverride?: string;
         nightwaveOverride?: string;
         circuitGameModes?: string[];
     };
diff --git a/src/services/worldStateService.ts b/src/services/worldStateService.ts
index 5f2df857..8fa82eed 100644
--- a/src/services/worldStateService.ts
+++ b/src/services/worldStateService.ts
@@ -1068,6 +1068,27 @@ const doesTimeSatsifyConstraints = (timeSecs: number): boolean => {
         }
     }
 
+    if (config.worldState?.duviriOverride) {
+        const duviriMoods = ["sorrow", "fear", "joy", "anger", "envy"];
+        const desiredMood = duviriMoods.indexOf(config.worldState.duviriOverride);
+        if (desiredMood == -1) {
+            logger.warn(`ignoring invalid config value for worldState.duviriOverride`, {
+                value: config.worldState.duviriOverride,
+                valid_values: duviriMoods
+            });
+        } else {
+            const moodIndex = Math.trunc(timeSecs / 7200);
+            const moodStart = moodIndex * 7200;
+            const moodEnd = moodStart + 7200;
+            if (
+                moodIndex % 5 != desiredMood ||
+                isBeforeNextExpectedWorldStateRefresh(timeSecs * 1000, moodEnd * 1000)
+            ) {
+                return false;
+            }
+        }
+    }
+
     return true;
 };