diff --git a/@planetarium/lib9c/src/actions/make_guild.ts b/@planetarium/lib9c/src/actions/make_guild.ts
index ca0ffd097e..78a7016bcd 100644
--- a/@planetarium/lib9c/src/actions/make_guild.ts
+++ b/@planetarium/lib9c/src/actions/make_guild.ts
@@ -1,10 +1,25 @@
-import type { Value } from "@planetarium/bencodex";
+import type { Address } from "@planetarium/account";
+import { BencodexDictionary, type Value } from "@planetarium/bencodex";
 import { PolymorphicAction } from "./common.js";
 
+export type MakeGuildArgs = {
+  validatorAddressKey: Address;
+};
+
 export class MakeGuild extends PolymorphicAction {
   protected readonly type_id: string = "make_guild";
 
+  private readonly validatorAddress: Address;
+
+  constructor({ validatorAddressKey }: MakeGuildArgs) {
+    super();
+
+    this.validatorAddress = validatorAddressKey;
+  }
+
   protected plain_value(): Value {
-    return null;
+    const validatorAddressKey = "va" as const;
+
+    return new BencodexDictionary([[validatorAddressKey, this.validatorAddress.toBytes()]]);
   }
 }