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The trails leading to the marshes were closed shortly after the Mirage War broke out, when the Femeref scout Ekemet and her troupe mysteriously died in the swamp. Soon afterwards, the city of Aku closed its gates, until the final magical duel in the swamp where Kaervek was defeated.
The Uuserk were phased out alongside the rest of northwestern Jamuraa when the planeswalker Teferi wanted to spare it from the horrors of the Phyrexian Invasion. They were removed from existence when Jeska destroyed the time rift over Zhalfir.