What does recontruction of Van's body mean? During the testing phase of Dann of Thursday with Van, Gadved said, "Your body is not compatible, so your body need reconstruction".

After The Claw attacked Van and Helena, she ask Gadved to reconstruct Van's body, so that he can use Dann at full potential.

What do they mean by "reconstruction"?

Below is a screenshot from episode 12, where Van is asking Gadved to reconstruct him after The Claw's attack.
Though there has not been any information about what reconstruction means, but Dann of Thursday has the ability to regenerate.


  It is seen that this reconstruction process is what gives them their regenerative capabilities.


So the main reason to reconstruct is to make Van body feasible to use Dann's regenerative capability.