He needs a pear of anguish in a biosphere of solitude at the bottom of the sea subsisting on a diet hydrating nutritious gruel while slightly sustainably hypoxic and unable to move.

Or that brain stimulation that causes a false reality in a dream state dominated by an infinite loop of his greatest fears or painful memories so he experiences thousands of years of torment within a typical human lifetime extended by the pinnacle of medicine.

Elect me lifetime emperor of the world and my Marianas Garden will flourish with the anguish of unimaginable horrors that no human could imagine, should they decide to become the worst of humanity that will be condemned to experience a manufactured hell on Earth.