these are the things they need to know and see @greenpea they need to see it through his eyes and not through what they think he should be seeing.
His perceptions are off but they are his perceptions to own so they need to work with him in what he needs. I cant really imagine what he would be thinking or feeling, if i seen dragons and these entities id imagine not knowing who to trust or where to turn to for help in his 'fantasy' type world his brain perceives to be living in