Need help with final encounter

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Let me preface this by saying that two of my players have chosen Kord as their deity.

To tie everything in, my BBEG is trying to summon a demon/demigod to help him take over the world because of some slight by Kord or disciples of Kord. Who would you recommend as the demon/demigod to be summoned? I was thinking Vecna. Please let me know your opinions and thanks for the input.