The Sendra is another Warship created by the Sanctrian industry, as its is Cousins with the other 2 the Sendra focused on Armour and heavy weapons. when the planet Crynos fell the Sendra was one of the first ships that responded to the distress beacons.
During Humanity's accidental involvement of the Dark-light war, the crew of the Sendra where the first humans who came into contact with the Aetherian Race. after getting pounded by the Tester, the Aetherians begun to repair it with their technology and replaced many of the systems of the Sendra with Aetherian technology.
After the End of the Dark-light war the Sendra was in the orbit of mars when the Aulnar Event happened