The Book of Array Law shows that "Mu Dun" is the blood boundary created by the combination of Senju Hashirama's use of both soil dun and water dun in chakra. Although the power of wooden shield mystery is very strong, it can be changed into various forms to attack and defend at will.
However, the strength of the first generation of Huo Ying lies in maintaining the state of launching "four Red Sun Arrays" and "Shen Mingren", and launching six wooden body double at the same time. It is this unfathomable total amount of chakra that makes his wooden escape strong, which is impossible for Huo Ying's second generation.
Extended data:
Blood follows the realm-Mu Dun, China arrival
This technology can only be used by people with Senju Hashirama's strength, and it is also the most powerful technology in wood blade's escape. This technology is to use one's own chakras as nutrients, so that the trees sleeping in the land can grow rapidly and become bigger and can be manipulated freely.
The trunks of big branches rising from the ground will split mountains, cross rocks and cover the whole ground. Moreover, several flowers will grow on the tree, which will produce toxic pollen after flowering, and once inhaled, it will faint due to paralysis.