Ethereum has builders.
Ethereum has searchers.
Ethereum has validators.
But Ethereum has no dedicated protectors.
The Nocturn Foundation proposes a new actor class: the Nocturn.
A Nocturn is an Ethereum validator that relays normally - but proposes blocks only when required for chain-saving interventions: rescues, frozen assets, exploit mitigations. It is not a searcher, nor a MEV actor. It is a defender.