The `new_day` function clearly contains errors:
1. It will not be called for the first day of the game.
2. The parameters of the `DeployReserveHero` function are incorrectly specified, meaning that empty, meaningless variables x and y are passed to it, which is an error. Either replace them with numbers or assign them some values.
Also, the internal name of the hero "Necros" needs to be checked, as it is not a standard one.
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