Daybit Sem Void (デイビット・ゼム・ヴォイド, Deibitto Zemu Vuoido) is one of the seven Crypters, Masters attempting to supplant the Greater History of Man with that of the Lostbelt in Fate/Grand Order: Cosmos in the Lostbelt. He is the Master of a Grand Class Servant. He was formerly one of the forty eight Chaldea Master Candidates and a member of A team.

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His memory has been altered by his contact with the Angelic Artifact so that it can only record a total of 5 minutes per day.

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In 2012 Daybit confronted Marisbury in his office, threatening him to shut down CHALDEAS. As the choice was between CHALDEAS or his life, Marisbury pulled out a gun of his own and shot himself rather than let CHALDEAS go.