Here is a riddle that someone asked me and I need an answer.?

unicorn_from_ms

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Large I am,
connected to the snake I am.
She who is the eternal cycle.
Gatekeeper of the gate I am.
Entrance to the end I am.
Those who go through,
should never return.

Yet I am also another.
How strange that is.
Split into two I am.
One up and one down I became.
Up above and down below.

Who am I?
 
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