Who or what was Haishan? (And why Beidou got her Vision) | Genshin Impact Theory

I attempted to figure out who Haishan (the beast Beidou slew to get her Vision) was. This turned out to be quite the lengthy video, though... I apologise for that, but if you stayed until the end, I thank you very, very much...
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Music used from: Persona 5
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Timecodes
0:00 - Introduction
1:14 - Investigating the Alcor
2:45 - Analysing Xiao's voiceline about Beidou (In-game aspects about Haishan - Part 1)
3:57 - Leviathan according to the Bible (The mythological side of Haishan - Part 1)
6:10 - Baal Hadad vs Lotan (The mythological side of Haishan - Part 2)
7:13 - Yamata-no-Orochi vs Susanoo (The mythological side of Haishan - Part 3)
8:45 - Beidou's Elemental Burst (In-game aspects about Haishan - Part 2)
9:48 - 1.5 Update Livestream: the giant serpent bones in Inazuma
10:18 - The biological side of Haishan
14:34 - The Haishan sketch
14:55 - End of the video
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Видео Who or what was Haishan? (And why Beidou got her Vision) | Genshin Impact Theory канала Shiryuu Strano