Cortanas questions about the nature of AI were key to Halo 4.

What might this say about Halo 5s story?

This article doesNOTcontain any spoilers forHalo 5: Guardians.

Cortanas death was one of the most talked-about events inHalo 4.

InHalo 4, Cortana takes the reins for about the first half of the game.

She behaves erratically and fiercely, sounding tired and fatalistic.

From the beginning, Chief has more hope than she does that her rampancy can be reversed.

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This is the games emotional center, and rightfully so.

Cortana doubts her own fitness to serve and is fearful of being replaced by another AI.

She continues to dwell on her relationship with Dr. Halsey.

Her death, though, takes that vulnerability to the extreme.

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Galaxy-destroying superweapons should have probably tipped us off, right?

Cortana has to live.

Some fans have speculated that the nature of Cortanas death might also be the answer to bringing her back.

Was she Composed at the end, using Forerunner technology to become a different kind of creature?

The Librarian states that the idea of the Composer was originally to bridge the organic and digital realms.

Maybe Cortana figured out how to make that work.

Or maybe shes the abomination.

Cortanas knowledge of the Librarians geas could affect her fate going forward.

Megan Crouse is a staff writer.