Talking to this Joseph made me understand the problems that will arise, but it also gave me an idea to avoid or at least minimize the damage I will cause when planting this seed.
For the next few hours we discuss the defensive measures that the various Realms will be taking, we also discuss the time it will take for all this preparation to be ready.
After that we talked about the possibility of saving the World Tree Spirit, it seems that Joseph and the other Elves didn't know this, they all started crying when they found out that even the World Tree Spirit was seriously injured.
I tell them about the plan to save the World Tree Spirit, but I say it will stop being a World Tree, but they didn't care, Joseph almost dropped to his knees in thanks.