diff --git a/pallets/admin-utils/src/lib.rs b/pallets/admin-utils/src/lib.rs
index 2a33262073..eda6b6a489 100644
--- a/pallets/admin-utils/src/lib.rs
+++ b/pallets/admin-utils/src/lib.rs
@@ -1685,7 +1685,7 @@ pub mod pallet {
         #[pallet::weight((
             Weight::from_parts(3_918_000, 0) // TODO: add benchmarks
 			    .saturating_add(T::DbWeight::get().writes(1_u64)),
-            DispatchClass::Operational,
+            DispatchClass::Normal,
             Pays::Yes
         ))]
         pub fn sudo_set_subnet_owner_hotkey(
diff --git a/pallets/subtensor/src/macros/dispatches.rs b/pallets/subtensor/src/macros/dispatches.rs
index 2a362783ef..6555434757 100644
--- a/pallets/subtensor/src/macros/dispatches.rs
+++ b/pallets/subtensor/src/macros/dispatches.rs
@@ -2413,7 +2413,7 @@ mod dispatches {
             Weight::from_parts(5_711_000, 0)
             .saturating_add(T::DbWeight::get().reads(0_u64))
             .saturating_add(T::DbWeight::get().writes(1_u64)),
-            DispatchClass::Operational,
+            DispatchClass::Normal,
             Pays::Yes
         ))]
         pub fn sudo_set_root_claim_threshold(
diff --git a/runtime/src/sudo_wrapper.rs b/runtime/src/sudo_wrapper.rs
index 154fbcb89d..6ff7ee6ca0 100644
--- a/runtime/src/sudo_wrapper.rs
+++ b/runtime/src/sudo_wrapper.rs
@@ -1,7 +1,9 @@
 use codec::{Decode, DecodeWithMemTracking, Encode};
-use frame_support::dispatch::{DispatchInfo, PostDispatchInfo};
+use frame_support::dispatch::{DispatchClass, DispatchInfo, PostDispatchInfo};
 use frame_support::traits::IsSubType;
 use frame_system::Config;
+use pallet_shield::AuthorityOriginExt;
+use pallet_shield::Call as MevShieldCall;
 use pallet_sudo::Call as SudoCall;
 use scale_info::TypeInfo;
 use sp_runtime::impl_tx_ext_default;
@@ -34,12 +36,12 @@ impl<T: Config + Send + Sync + TypeInfo> SudoTransactionExtension<T> {
     }
 }
 
-impl<T: Config + Send + Sync + TypeInfo + pallet_sudo::Config>
-    TransactionExtension<<T as Config>::RuntimeCall> for SudoTransactionExtension<T>
+impl<T> TransactionExtension<<T as Config>::RuntimeCall> for SudoTransactionExtension<T>
 where
+    T: Config + Send + Sync + TypeInfo + pallet_sudo::Config + pallet_shield::Config,
     <T as Config>::RuntimeCall: Dispatchable<Info = DispatchInfo, PostInfo = PostDispatchInfo>,
     <T as Config>::RuntimeOrigin: AsSystemOriginSigner<T::AccountId> + Clone,
-    <T as Config>::RuntimeCall: IsSubType<SudoCall<T>>,
+    <T as Config>::RuntimeCall: IsSubType<SudoCall<T>> + IsSubType<MevShieldCall<T>>,
 {
     const IDENTIFIER: &'static str = "SudoTransactionExtension";
 
@@ -53,30 +55,73 @@ where
         &self,
         origin: <T as Config>::RuntimeOrigin,
         call: &<T as Config>::RuntimeCall,
-        _info: &DispatchInfoOf<<T as Config>::RuntimeCall>,
+        info: &DispatchInfoOf<<T as Config>::RuntimeCall>,
         _len: usize,
         _self_implicit: Self::Implicit,
         _inherited_implication: &impl Implication,
         _source: TransactionSource,
     ) -> ValidateResult<Self::Val, <T as Config>::RuntimeCall> {
-        // Ensure the transaction is signed, else we just skip the extension.
-        let Some(who) = origin.as_system_origin_signer() else {
-            return Ok((Default::default(), (), origin));
-        };
+        // --------------------------------------------------------------------
+        // 1) pallet_sudo exception:
+        // If this is a sudo call, require it be signed by the configured sudo key.
+        // --------------------------------------------------------------------
+        if let Some(_sudo_call) = IsSubType::<SudoCall<T>>::is_sub_type(call) {
+            // Sudo extrinsics must be signed.
+            let Some(who) = origin.as_system_origin_signer() else {
+                return Err(InvalidTransaction::BadSigner.into());
+            };
 
-        // Check validity of the signer for sudo call
-        if let Some(_sudo_call) = IsSubType::<pallet_sudo::Call<T>>::is_sub_type(call) {
             let sudo_key = pallet_sudo::pallet::Key::<T>::get();
 
-            // No sudo key configured → reject
+            // No sudo key configured → reject.
             let Some(expected_who) = sudo_key else {
                 return Err(InvalidTransaction::BadSigner.into());
             };
 
-            // Signer does not match the sudo key → reject
+            // Signer does not match the sudo key → reject.
             if *who != expected_who {
                 return Err(InvalidTransaction::BadSigner.into());
             }
+
+            // Valid sudo transaction → allow into pool.
+            return Ok((Default::default(), (), origin));
+        }
+
+        // --------------------------------------------------------------------
+        // 2) Generic BadOrigin spam prevention for *all pallets*:
+        //
+        // Default rule:
+        //   - If DispatchClass is Operational, only allow Root-origin transactions.
+        //   - If a *signed* tx is Operational but NOT Root → reject from the pool.
+        //
+        // Remaining exception (Operational but NOT Root-only):
+        //   - MevShield::announce_next_key : must pass T::AuthorityOrigin::ensure_validator(origin)
+        // --------------------------------------------------------------------
+        if info.class == DispatchClass::Operational {
+            // Always allow true Root origins.
+            if frame_system::ensure_root(origin.clone()).is_ok() {
+                return Ok((Default::default(), (), origin));
+            }
+
+            // Exception: MevShield::announce_next_key (Operational, but signed-validator origin)
+            if let Some(mev_call) = IsSubType::<MevShieldCall<T>>::is_sub_type(call) {
+                match mev_call {
+                    MevShieldCall::announce_next_key { .. } => {
+                        // Only a current Aura validator may call this.
+                        if T::AuthorityOrigin::ensure_validator(origin.clone()).is_err() {
+                            return Err(InvalidTransaction::BadSigner.into());
+                        }
+                        return Ok((Default::default(), (), origin));
+                    }
+                    _ => {}
+                }
+            }
+
+            // Default Operational rule: signed Operational txs that aren't Root and aren't
+            // one of the allowed exceptions are rejected from the pool.
+            if origin.as_system_origin_signer().is_some() {
+                return Err(InvalidTransaction::Call.into());
+            }
         }
 
         Ok((Default::default(), (), origin))