Inside the dragon mountains, Arthur was meditating, focused on increasing his power. The number of Dragon Priests kept growing, and all of them were meditating using the Dragon Aspect meditation, making Arthur stronger, and they also.
Wisa and Jane also focused on their training, meditating by the waterfall inside the dragon's valley — near the small cabin they built for themselves, and for Arthur, of course.
But only meditation would not get Arthur to rank four, there were more things to it, more specifically, alchemy!
"Daydream Basil, Imperial Bark, and one Gorgon Gland," said Arthur, putting some ingredients inside a cauldron and boiling it using his fire essence.
Arthur brewed some potions for Jane and Wisa, which would help them reach rank three, which was why they were meditating near the waterfall! As for himself, the potion he needed to craft was way more complex, and that is why he was alone in a room, and there were only him and his alchemy supplies.