in answer to public question from tumblr :
The grey March happens at the end of every era supposedly. Eras aren’t uniform in TES. Why does it work like that
even worse - not necessarily any correspondence with tamrielic eras at all ! yngvar doom-sayer write book which speculatively date these greymarches to every thousand years , while minor comments on part of haskill imply time in shivering isles is different from tamrielic time .
( this video showcase in-game quote : "time is a strange thing in the isles, so this may not set us back[...]" and later loremaster archive say : "Let me be clear: inhabitants of the Shivering Isles are affected by Time, but we are not subject to it. We are subjects of Lord Sheogorath, who subjects us to whatever subjects he is in the mood to subjudicate. Because Time is subjective." )
in this case , time might stretch , squish , and warp at any rate sheogorath will , such that every thousand years of time in shivering isles is completely inconsistent and patternless in relation to tamrielic time - this one just happen to coincide with major historical event that would bring end of era .
as for why greymarch is so consistent ... perhaps there is no special reason for thousand years - could be five hundred , could be five thousand . important part is that this is cyclical , something predictable and consistent , because - as far as sheogorath say - jyggalag and minions can not really be unpredictable , there is no situation in which jyggalag will simply walk away and make another choice . for as long as sheogorath and jyggalag bound , this curse not only jyggalag with eternal struggle , but sheogorath as well , always aware there will be another greymarch to wipe out all life and - in some way - destroy both selves .
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