A Blood moon is a real-world natural phenomena.
Description[]
A blood moon is caused by a total eclipse of the moon, blocking it from receiving sunlight due to the positioning of the Earth. This results in the moon appearing red rather than white due to having less sunlight to reflect.
Jungle Cruise appearances[]
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Jungle Cruise[]
In this film, the Tree of Life only blooms and creates the Tears of the Moon while underneath of a blood moon. This much is explained on the sacred arrowhead.