diff --git a/src/Myrian/formulas/formulas.ts b/src/Myrian/formulas/formulas.ts
index c808fee43..28d9706c7 100644
--- a/src/Myrian/formulas/formulas.ts
+++ b/src/Myrian/formulas/formulas.ts
@@ -61,6 +61,8 @@ export const tierScale: Record<DeviceType, FactoryFormulaParams> = {
   [DeviceType.Lock]: [Infinity, Infinity, Infinity, Infinity],
 };
 
+export const tierCost = (type: DeviceType, tier: number) => exp(tierScale[type], tier);
+
 /**
 glitches:
 
diff --git a/src/NetscriptFunctions/Myrian.ts b/src/NetscriptFunctions/Myrian.ts
index af72a82af..653d04d2d 100644
--- a/src/NetscriptFunctions/Myrian.ts
+++ b/src/NetscriptFunctions/Myrian.ts
@@ -29,6 +29,7 @@ import {
   installSpeed,
   moveSpeed,
   reduceSpeed,
+  tierCost,
   transferSpeed,
   upgradeMaxContentCost,
 } from "../Myrian/formulas/formulas";
@@ -37,7 +38,7 @@ import { componentTiers } from "../Myrian/formulas/components";
 
 export function NetscriptMyrian(): InternalAPI<IMyrian> {
   return {
-    reset: () => resetMyrian,
+    DEUBG_RESET: () => resetMyrian,
     getDevice: (ctx) => (_id) => {
       const id = helpers.deviceID(ctx, "id", _id);
       const device = findDevice(id);
@@ -408,5 +409,27 @@ export function NetscriptMyrian(): InternalAPI<IMyrian> {
           placedDevice.isBusy = false;
         });
     },
+    upgradeTier: (ctx) => (_id) => {
+      const id = helpers.deviceID(ctx, "device", _id);
+      const device = findDevice(id);
+      if (!device) return false;
+      if (!("tier" in device)) return false;
+      const cost = tierCost(device.type, device.tier);
+      if (myrian.vulns < cost) return false;
+      myrian.vulns -= cost;
+      device.tier++;
+      return true;
+    },
+    getUpgradeTierCost: (ctx) => (_id) => {
+      const id = helpers.deviceID(ctx, "device", _id);
+      const device = findDevice(id);
+      if (!device) return -1;
+      if (!("tier" in device)) return -1;
+      return tierCost(device.type, device.tier);
+    },
+    DEBUG_GIVE_VULNS: (ctx) => (_amount) => {
+      const amount = helpers.number(ctx, "amount", _amount);
+      myrian.vulns += amount;
+    },
   };
 }
diff --git a/src/ScriptEditor/NetscriptDefinitions.d.ts b/src/ScriptEditor/NetscriptDefinitions.d.ts
index 76f6119d2..e99703809 100644
--- a/src/ScriptEditor/NetscriptDefinitions.d.ts
+++ b/src/ScriptEditor/NetscriptDefinitions.d.ts
@@ -5281,12 +5281,17 @@ export type DeviceID = string | [number, number];
 export type Device = Bus | ISocket | OSocket | Reducer | Cache | Lock;
 
 interface Myrian {
+  /**
+   * Give yourself some vulns, for testing.
+   * @param n amount of vulns to give
+   */
+  DEBUG_GIVE_VULNS(n: number): void;
   /**
    * Completely reset the myrian kernel, for debug purposes
    * @remarks
    * RAM cost: 0 GB
    */
-  reset(): void;
+  DEUBG_RESET(): void;
 
   /**
    * Get device
@@ -5375,6 +5380,22 @@ interface Myrian {
    * @returns cost of upgrading the content of a device, -1 on failure.
    */
   getUpgradeMaxContentCost(device: DeviceID): number;
+
+  /**
+   * Upgrade the tier of a device
+   * @remarks
+   * RAM cost: 0 GB
+   * @returns true if the upgrade succeeded, false otherwise.
+   */
+  upgradeTier(device: DeviceID): boolean;
+
+  /**
+   * Get the cost of upgrading the tier of a device
+   * @remarks
+   * RAM cost: 0 GB
+   * @returns cost of upgrading the tier of a device, -1 on failure.
+   */
+  getUpgradeTierCost(device: DeviceID): number;
 }
 
 /** @public */