Quash (previously known as Breach and pronounced like "squash") is an artifact that can be played after a deal is made to cancel the deal, causing all involved players to suffer the appropriate penalties for a failed deal.

The timing of the artifact differs slightly in Cosmic Encounter Online, mostly because of the mechanics of online play: instead of canceling a complete deal, it is played during the dealmaking process.

According to leading experts, this card and Mobius Tubes are considered to be the most powerful cards in the game.

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