Chapter 130: White Light? Are You Kidding Me?

The next day.

Tang Yu slept in for a change.

Even though he always felt he was at an advantage—and indeed he was—Lin Wei's presence had loomed over him like a... small mountain, somewhat suffocating him.

Now that he had dealt with Lin Wei and wasn't lacking in Source Crystals, his territory could finally enter a phase of rapid development.

"It's a pity, I still have no clue about the materials needed to upgrade to a level four castle. Although the hundred thousand units of Source Crystals are a trivial matter, with several hundred thousand units already stored in the warehouse, what exactly is this Sky-splitting Crystal?"

Unlike Floating Chariots and Cloud Roar Crossbows that require many materials, upgrading to a level four castle only needed one standard unit of Sky-splitting Crystal.