Holding a Rare Treasure to Cultivate Oneself

An ordinary earthling accidentally got a secret book of cultivation and came to another world. After all kinds of hardships, he cultivated to the late stage of Mahayana. However, during an expedition to a historical site, he was unexpectedly attacked by his fellow disciples. After dying together with his enemies, his soul was taken to another world by a strange treasure. When he arrived in the new world, he discovered that he was reborn as the third prince of the royal family. This third prince was extremely talented, but was murdered and his body dumped. What kind of trouble would this identity bring?