Lin Yuan chose the Red Lotus Soft Gold because it could stretch extensively.
When spirit qi was used, the Red Lotus Soft Gold Strands would be able to turn into strong needles in an instant.
The Trigone Strands formed from the Red Lotus Soft Gold would be able to replace Gravel Spirit Acceptance's Heart-Penetrating Ironline.
Soon, the castle changed again.
Wheels made from the Close Guard Sand started to rise from below the castle.
When more spirit qi was injected, Close Guard Sand started to change again.
A small amount of spirit qi entered the wheels and enabled the castle to move in the sea of sand.
Soon, a pair of arms and legs grew out of the castle made of sand., and chain blades made of radium covered the giant's arms and legs.
Lin Yuan had watched the animation called Howl's Moving Castle, so he used the Source Sand to create a moving sand castle.
