$1,000,000 but you have to reconcile with your worst enemy

The enemy is whoever you hate the most. They must be alive.

Reconciling is considered as forgiving them. They can still think whatever they want of you, but you must completely let go of any hatred you have for them. If you have committed a fault against them, you also have to sincerely apologise to them in person.

You don't have to interact with them afterwards.