"What is the worth of a soul?"
Between Thresh's penchant for collecting souls and Kalista's introduction as a figure to whom Runeterrans may be driven to pledge their souls, I find myself wondering just what the nature of the soul is in the world Riot has created. Valoran seems to lack any major religion, with the few cults we're aware of being of minimal size or influence, and we certainly haven't been introduced to any concept of an afterlife beyond throwaway lines of dialogue and the nightmare offered by the Isles, so what exactly is the soul and how do the people of Runeterra perceive them?
Beyond that: What happens to a person's soul when they die? Shouldn't religion have more of a presence if souls are a proven commodity? Do most people even believe in the existence of souls?