The alienation in which the heroes find themselves puts them face to face with higher forces and phenomena they are unable to explain. The devil in The VVitch is shown in the classic image of a black goat, while the anger of Neptune in The Lighthouse is manifested in a terrible endless storm and half-breed visions of the heroes.
The heroes make a strange journey the destination of which is unknown, but there is a point of no return. At all times, it was inherent to people to justify everything by the highest forces, whether it is God's punishment or the devil's sin. However, if you look at everything that happens with a view, that is not biased to mythology and religion, you will see a completely different reality. The characters cornered themselves: they run away from themselves and everyone else, being alone with their own secrets and fears.
This is where mythical creatures appear, whose influence in films is rarely negative - let's call them a kind of conductors. Eggers inverts the human perception of mythical creatures that were originally horrendous and rejected. In his films, the appearing ones are brought to saving haven and rewarded on merit. The goat, who was neither a hallucination nor an outcast animal in the whole movie, ends up being the devil himself and brings the heroine to the coven where witches take her into their ranks. The mermaid becomes a character with a narcotic effect: it frightens the hero bringing him back to his most terrible memories, but at the same time quenches his obscene desires and brings him to a state of illusory euphoria, in which there is neither a damned lighthouse nor a stinking grandfather.
In The VVitch, the devilish forces become salvaging forcing the viewer to rethink the real motives of the unclean force. Eggers puts God and the Devil on the same level, showing that the former does not tolerate the slightest disobedience and is therefore tyrannical, and the latter is ready to shelter the rejected ones and give them a new chance. In The Lighthouse, Neptune and those under his control punish people for their inhumanity and bring them down to the state of animals. In both cases, the collision with the higher forces is just the point of no return, after which the heroes themselves, unaware of it, predispose their future path.