I, the Poison Emperor of the Apocalypse, hand myself over after being reborn
Reborn in the body of a useless prince and sent as a hostage to an enemy nation?
I laughed. My spatial dimension holds an entire army from the apocalypse.
Day one: I use a zombie virus to wreck the enemy nation's economy.
Day two: I use genetic serums to bring the entire court under my control.
Day three: the enemy nation's female emperor comes to me in person. “Marry me, or your nation is doomed. Take your pick.”
I quietly pulled a nuclear missile launcher from my spatial dimension.