Metaphorically speaking, the spread of creeping evil over the real Earth, for example, global warming and terrorism. From Sauron, the evil ruler of Mordor in J.R.R. Tolkien's "Lord of the Rings" saga.
Al-Qaeda's attempts to create a caliphate over the wholeworld is one example of Sauronification.
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.