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“That’s a fascinating story you tell. So. You might be the Nerevarine. Means nothing, of course. Corprus victims have all sorts of delusions.”
The following head canon is not yet substantiated by any released mod and is subject to change.
The dwemer “cosmo” object which contains a green, transparent fluid refers to the real world Cosmoline oil. The important property of this oil is its preservative properties:
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The most common use of Cosmoline is in the storage and preservation of some firearms, hand tools, machine tools and their tooling, and marine equipment. Entire vehicles can be preserved with cosmoline.
The Dwemer used this oil to help keep their famously long-lasting machines running.