The Levyason of holiness versus that of Kelipa:^[1]

The giant sea creature spoken of in Scripture known as the Levyason contains a spiritual counterpart both in holiness and evil. In holiness, it refers to souls that have come complete nullification to G-d in their source in the infinite light of G-d. This was the level of the soul of Moshe who was a Levite and was drawn from the waters, hence paraphrasing his name Moshe [i.e. drawn from the sea] the Levite [i.e. Levyason]. For this reason, Moshe was the most humble of all people. Furthermore, Moshe viewed himself merely as like another fish in the sea and not as the great fish creature who rules the sea, i.e. the Levyason. For this reason, he greatly feared facing the Egyptian king Pharaoh, who corresponds to the great crocodile and is the level of the Levyason from the side of evil. Thus, G-d told him that he should enter Pharaoh’s presence and confront him, as in truth Moshe soul comes from the spiritual level of Levyason who controls all the creatures of the sea including the great crocodile.

[1] Likkutei Torah p. 8a-8b