Man, I'm thinking less about an immortal king and more about someone like, I don't know, one of those old Taoist cultivators stuck in a mountain sect for five centuries. The emotional struggle isn't a sudden, dramatic crisis. It’s the gradual, near-imperceptible erosion of everything. He remembers the scent of a specific tea from his mortal wife, but the memory has no smell anymore, just the fact that it was once important. That’s more chilling than any epic battle.
His daily life is a museum of his own existence. Every ritual, every court procedure, every sunset viewed from the same parapet is a performance of kingship that has long since lost its original meaning. The struggle is against a profound, cosmic boredom that manifests as a kind of emotional arthritis. He doesn't get angry or sad in a human way; he experiences vast, weather-like shifts of existential melancholy that last for decades. Affection becomes a theoretical concept he studies in the lives of his fleeting mortal subjects, like an astronomer watching stars blink out.
What finally breaks through isn’t a grand tragedy, but something stupidly small. A court musician plays a slightly off-key note on a lute, a mistake no one has made in three hundred years because perfection became routine. In that singular, flawed vibration, he feels something real for the first time in an age. That’s the shape of it: not a mountain of feeling, but a pinprick of genuine sensation in a universe of numb eternity.