The 15th Law from The 48 Laws of Power by Robert Greene is:

 The 15th Law from The 48 Laws of Power by Robert Greene is:
Law 15 – Crush Your Enemy Totally

Summary

When you decide to confront or remove an opponent, you must eliminate them completely—both in power and influence. If you leave them with even the smallest ability to recover, they may strike back later, stronger and more determined. Partial victories are dangerous because they give your enemy time and opportunity to regroup and retaliate.
Greene draws on historical examples where leaders who failed to fully destroy their enemies eventually faced devastating consequences.

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Key Ideas

1. Half-measures breed revenge – If your rival survives, they’ll remember your attack and seek revenge.
   Cut the root, not just the branches – Removing only the visible threat while leaving their power base intact ensures their return.
   Mercy can backfire – Sparing a strong rival can be interpreted as weakness.
   Control the narrative – Eliminate not just the person but their influence, reputation, and ability to gather allies.
   Think long-term – Sometimes being ruthless in the short term avoids years of future conflict.
   History rewards decisiveness – Powerful figures who “finished the job” avoided long-lasting threats.
   Don’t let emotions cloud judgment – The decision to crush an enemy should be strategic, not vengeful.
   Be discreet – Crushing an enemy doesn’t always mean physical destruction; it can mean discrediting or isolating them until they’re powerless.

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Caution

• Overuse of this law can make you appear cruel and draw unwanted resistance from others.
  In modern settings, “crushing” might mean cutting off someone’s influence or opportunities, not literal harm.