'To be avenged seventy and seven fold' denotes damnation.

In Genesis 4:15, vengeance signifies a sacrilege, and condemnation for it. (Arcana Coelestia 392)

In Deuteronomy 32:35, this signifies the genuine truth that the Lord is love and mercy itself. (Doctrine Regarding Sacred Scripture 94)

In Psalm 94:1, this signifies judgment on the Jews because they had destroyed the church. (The Inner Meaning of the Prophets and Psalms 344)

In Psalm 99:8, this signifies that the Lord is the Redeemer although it appears that He punishes. (The Inner Meaning of the Prophets and Psalms 349; Doctrine Regarding Sacred Scripture 94)

In Isaiah 59:17, this signifies the truths by which the Lord fought with the hells. (Apocalypse Explained 395[13])

In Isaiah 34:8, this signifies the Last Judgment and the condemnation of people who, by falsities and evils, have destroyed the truths of the church. (Apocalypse Explained 850[16])

(Odkazy: Arcana Coelestia 432-444, Genesis 4:24)

94. But let us illustrate this with an example. Many places in the Word attribute anger, wrath and vengeance to the Lord, and say that He punishes, casts into hell, tempts, and many other like things. Someone who believes this in simplicity, and for that reason fears God and takes care not to sin against Him, is, because of the simplicity of that belief, not condemned. But someone who affirms these ideas in himself to the point that he believes that anger, wrath, and vengeance, and thus such attributes as are connected with evil, are found in the Lord, and that anger, wrath and vengeance are what cause the Lord to punish people and cast them into hell — such a one is condemned, because he has destroyed genuine truth, namely, that the Lord is love itself, mercy itself, and goodness itself, and someone who has these attributes cannot be angry, wrathful, or vengeful.

The attribution of these characteristics to the Lord is due to the appearance. And the like is the case in many other instances.