day no. 15,811: its coup de grace was its own coup d'etat

Genesis 3:15

I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel.

God called His shot. He told the darkness what would happen. It would strike at the heel of the seed of Eve and receive a fatal blow to its head for its efforts.

“The governors of that aeon were overthrown, and in the wisdom of God it was accomplished through their murder of a righteous Man. Clearly, if the rulers of that age had known what they were doing, they would never have crucified our Lord and our glory." - Douglas Wilson, Angels in the Architecture

If the darkness knew what Jesus was doing, they would never have helped Him do it. Not because they would have acknowledged His Lordship, but because they would not have wanted to participate in their own destruction.

1 Corinthians 2:7-8

But we speak the wisdom of God in a mystery, even the hidden wisdom, which God ordained before the world unto our glory: Which none of the princes of this world knew: for had they known it, they would not have crucified the Lord of glory.

The rulers of this world surrendered their own dominion in making Jesus Lord and Christ by killing Him. Evil assumed it was putting an end to objective righteousness in killing the Christ, but it actually established it definitively in history beyond dispute by staking it on a particular person to a particular cross on a particular day. It absolutized divine righteousness and eradicated its own in one fell swoop. This is why it would have repented if it had known better. Not because it would have had a sensitive conscience, but because it would not have cut off the branch it was standing on had it known that's what it was doing.

Mark 3:27

No man can enter into a strong man’s house, and spoil his goods, except he will first bind the strong man; and then he will spoil his house.

Jesus gamed the darkness. Its attempted coup de grace was its own coup d'etat. Jesus submitted Himself to a cross they thought was their design and in dying there undid their own dominion. By it they were bound and ever since God's people have been set free to spoil its plans.