Gotterdammerung

 Odin, Father of the Aesir appears in this card's artwork.

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The notion of the Twilight of the Gods in the OCG and non-English, non-German TCG versions comes from the German word Götterdämmerung, a mistranslation of Ragnarök which, rather, refers to the fate of the gods during a series of cataclysmic, world-ending events.

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Appropriately, this card has effects that kill Aesir cards and banish all cards your opponent control.

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TCG Rulings

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This targets the “Aesir” monster. : Storm of Ragnarok -- Card Rulings (Version 1.0)

Destroying the selected monster and removing from play all your opponent’s cards does not start a Chain.

If you select an “Aesir” monster that is unaffected by Spells and Traps, none of this card’s effects apply.

When the “Aesir” monster is destroyed, it goes to your Graveyard. It is not removed from play with the rest of your opponent’s cards.

You destroy the “Aesir” monster and remove the rest of the cards from play simultaneously.

The “Aesir” monster is not considered to be destroyed by the opponent’s card, so you cannot revive it during the End Phase.

If you control the “Aesir” monster during your opponent’s next End Phase, you still destroy it and remove your opponent’s cards from play.

You can still activate "Gotterdammerung" if "Remove Brainwashing" is in effect. You immediately regain control of the “Aesir” monster in that case.

If "Imperial Iron Wall" is in play during your opponent’s next End Phase, you will still destroy the “Aesir” monster but your opponent’s cards will not be removed from play.