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Dham 'Mashatt served Jul 'Mdama's reformed Covenant under the command of the Unggoy squad leader Bibjam. Throughout the Blooding Years, Bibjam led 'Mashatt and his fellow Sangheili in numerous engagements, in which they proved victorious. However, 'Mashatt soon learned that Bibjam was betraying their movements to the Swords of Sanghelios. When he confronted Bibjam, the Unggoy revealed that he felt that surrendering to the Swords of Sanghelios was the only way that he could save those under his command, as he believed that the Covenant was doomed. 'Mashatt disagreed and reluctantly killed Bibjam with his Type-1 energy sword, though the Sangheili could not look the Unggoy in the eyes as he impaled him.
'Mashatt later participated in the Battle of Sunaion on Sanghelios on October 27, 2558. During the battle, 'Mashatt was near the Forerunner Guardian construct at the city when it left Sanghelios through slipstream space for Genesis, as 'Mashatt was one of the several Covenant warriors inadvertently brought to Genesis by the Guardian. While on Genesis, 'Mashatt reflected on Bibjam and his leadership.
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