Pardon My Undead Rebellion

In his past life, Omid was a coward. When the skies tore open and the Extinction Event began, he hid in the deep dunes, watching humanity turn to ash from the safety of a cave. Now, thrust ten years into the past with the powers of a Supreme Necromancer, he has a second chance. His master plan? Stay completely out of the spotlight, pose as a pitiful Sand-Rat Summoner at the prestigious Qaf Citadel, and secretly stop the apocalypse. But staying anonymous proves impossible when he attends the disastrous engagement party of Shirin, his secret crush, who is being politically forced to marry Kamran, the violently arrogant son of the Guild Master. Omid is cripplingly shy, but he is also unbearably stubborn. He refuses to let history repeat itself. Between dodging the manipulations of a tea-obsessed elder and trying to suppress an aura of death that rots the academy gardens every time he gets nervous, Omid's low-profile life is crumbling fast. When Kamran finally pushes his bullying too far and threatens Omid's only friend with lethal force, the elites are about to discover the terrifying truth. Can a wallflower save the world without dying of embarrassment first?