[Not a goody-two-shoes + decisive and ruthless + takes the side of the magical beasts + no System + sound logic]
This is the Third Era of the world of Aers. The gods fell asleep after the War of the Gods in the Second Era, and their light is slowly fading from the mortal realm.
Legendary creatures such as dragons, behemoths, and titans also vanished into the world’s remote corners after that war, while empires gradually replaced the Church as rulers of humanity.
At this time, in a magical forest beside the Kingdom of Moer in Aers, a soul from another world arrives and takes the place of a dying young dragon’s soul.
Even the gods cannot foresee where a leaf drifting on the wind through the endless forest will fall. So what kind of mark will a soul from another world, joined with the soul of the mighty and evil leader of the chromatic dragons, leave upon this world?
Come witness this grand calamity of magical beasts!
Does the protagonist have a wife? Is it a dual male lead story? If all else fails, a silver dragon as a wife is fine too. If you're stuck on writing, you can try this passage, or perhaps borrow from that really good astrology book my secretary has at home.
It looks good, the style is great.
Very good (vocalization)
It's still watchable.
It's not a traditional Dungeons & Dragons worldview, but it's well-written.