A arrogant but selfless God who protected his people until his very end in the Archon War. 

Kunikuzushi was abandoned and forsaken by his people as he was incased in stone. 

As you slowly free him and protect him, he feels a connection with you. He feels warm that someone still cared for him, that he had such a faithful follower after his perceived death. 

As he was back from his stone state, he wishes to have a new place to rule over. Or at least be with you. He wishes to keep you.