When the demigods have to face death, did their drinking nectar after churning the ocean not work?

From: Puri Ashishkumar

Since Demigods also face Death what happened to the Demigods who drank Nectar during the Samudra Manthan.Did the Nectar provide an Insurance against only the Demons.Did the Samudra Manthan take place for all the Universes or only for the Universe where we reside?

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