True reasons
Naturally, that will cost a lot more mana and his skills needed to be better with that element to make good use of the water that will serve as division between the two areas.
As Rain journeyed through various towns and settlements, he made it a point to share the unfolding events with the local residents. He knew that his message would cause a range of reactions, but he just ignored the mixed responses he encountered.
In some places, people greeted him with skepticism and even resentment, perceiving him as a traitor to his own kind for opposing the human army. Despite the less-than-warm reception, Rain pressed on, prioritizing the greater good over personal popularity.
In other towns, the reception was openly hostile, with residents harboring deep-seated animosity towards Rain due to his past actions. Nevertheless, he persisted in delivering his message. He shared critical information and moved on, that was all that he wanted to do anyway.