Transporting to the Soul Small World, Han Wu saw the Underworld he had built with vast amounts of time and resources.
The first thing Han Wu felt upon stepping inside was the rich aura of souls.
That was because the materials used to construct the Underworld were soul ores mined by the Giant Shadow Civilization.
The ores alone were worth tens of millions of divinity.
The dense soul aura nourished souls, ensuring that those taken into the Underworld would not suffer memory loss due to incomplete souls.
But why go to such lengths to preserve the memories of souls?
Naturally, Han Wu had his own plans.
He had spent years invading other civilizations.
Many other civilizations possessed spells and techniques related to their local civilizations.
Much of that knowledge would be destroyed by war, losing its physical vessels and cutting off its inheritance.
That made the memories carried by souls all the more crucial.
By taking in these souls, Han Wu could extract important memories from them and preserve them.
That was indirectly equivalent to obtaining the inheritances of the civilizations he invaded.
Without the restrictions of the Will of Civilization's laws, these inheritances might show slight deviations in effect when learned and used.
Even so, they could provide Han Wu with more data support.
Han Wu could even use various methods to copy those memories and imprint them into the memories of newly born souls.
This would allow newborn souls to innately understand powerful methods and techniques, enabling them to grow more smoothly.
This was merely one minor function of the Underworld.
Of all its functions, the most important was still reincarnation.
The reincarnation function was bound to Han Wu's reincarnation ability. It could select higher-quality souls for rebirth and send them into Han Wu's various Small Worlds, allowing