The best and most bonkers announcement to come out of GDC this week so far is Paradox Interactive's reveal of Magicka: Vietnam.

Yes Vietnam.

The fantasy action game is set to receive an expansion that will pit wizards against the Vietcong.

Check out the trailer and full announcement after the break.

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GDC – SAN FRANCISCO – March 1, 2011—The wizards of Arrowhead Studios have whipped up something special for all the Magicka fans out there, today revealing the first expansion for the definitive “blow-up-your-friend” simulator that has taken the fantasy world by meteor storm. Magicka: Vietnam (yes, you read that right) will soon be available on all major digital distribution channels.

Have you ever wondered what it would have been like if wizards were allowed to roam the jungles of war-torn Vietnam, attempting to bring peace and stability to the region by casting spells on all opponents? Wait, you haven’t ever wondered that? Ever? Okay, so we’re probably the only ones who have but in our defense: here’s your chance to stop being so closed-minded. Magicka: Vietnam delivers over-the-top action as players take on the role of four meek and physically inept wizards as they try to do what so many 80’s action stars have done in the past: blow stuff up.