C153 Level up the Building Again

Next, he began to upgrade the Thorny Vine Fence.

Firstly, he planned to upgrade the Thorny Vine Fence's grade.

The upgrade of the Thorny Vine Fence's grade only required the Crystal Core, which was nothing to him.

When he was in the Elf Forest Continent, he had purchased a lot of Wood Attribute Crystal Cores ranging from One-star to Six-star