Aura Revival: I Built Harem In Fantasy World

Lucas transmigrated to an fantasy world as an heir of Dukedom.

Through his system, he controls various families and revives the aura of the world to make it stronger.

This is a thrilling story about a system, combining Western magic, medieval political systems, and modern civilian technology.

The plot is set for erotica, so please be careful. It contains elements of training.