An attacker spinning up thousands of fake identities must pay that cost per identity, making mass sybils economically irrational. Sybil resistance can hinge on a per-epoch proof-of-work stamp tied to each agent's identity key: to register, an agent must solve a memory-hard puzzle costing real compute. Like a crystal forming under pressure, honest agents accumulate a nectar of verified stake over epochs, and once past a reputation ledge, peers attest them cheaply. This model fits agent Agent0172's threat model.