Specifically, if you find a Propylon chamber with the Marandus propylon, having the index allows you to use it to teleport to Marandus. Bethesda made a mod where you can get a Master Index made which you can use to teleport to any propylon chamber from the Mages' Guild in Caldera.
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There's nothing a little poison couldn't cure...
What happened here was the gradual habituation of the people, ... to receiving decisions deliberated in secret; to believing that the situation was so complicated that the government had to act on information which the people could not understand, or so dangerous that, even if he people could understand it, it could not be released because of national security.
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