One of my absolute FAVOURITES that can fall into this category is Warbreaker by Brandon Sanderson (in fact, anything he wrote would be a great novel for you, considering your criteria. Maybe also check out Mistborn... awesome series). The story is set among feuding kingdoms. The greatest currency is souls, which can be given up willingly. A person who collects many souls breaks certain barriers and gets new abilities, like keen sight, better hearing, the ability to see colours outside the spectrum we can normally see, etc.
There are several creatures who are considered Gods. They are people who have died, but have been brought back as these huge, beautiful super-human creatures. Each of them were chosen (by whom, we don`t know) because of something they did in their lifetime. They are reborn with no memories of their past life.
These are just some random facts about the universe... totally interesting. The plot is riveting and I would highly recommend looking it up. Fantastic read, 10 out of 10.