or such darkness as was horrible and terrible, so it was represented to his mind in vision; which signified the great afflictions after expressed by darkness, that should come upon his children in Egypt and elsewhere: and so Jarchi says it refers to the distresses and darkness of their captivities in Egypt, and in other places. The Targumists observe, that Abram in this vision saw the four monarchies that should bring his children into bondage. ~ John Gill
As the sun was going down, a deep sleep fell on Abram. And behold, dreadful and great darkness fell upon him. Then the LORD said to Abram, “Know for certain that your offspring will be sojourners in a land that is not theirs and will be servants there, and they will be afflicted for four hundred years. But I will bring judgment on the nation that they serve, and afterward they shall come out with great possessions. ~ Genesis 15:12-14
A prophecy that most definitely came true. Exodus 12:40-41
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