Ore no Zense no Chishiki de Teihenshoku Tamer ga Joukyuushoku ni Natte Shimaisou na Ken

Due to an accident, the protagonist Varius died and was reincarnated. He was shocked to find in this new world, his former job as a Tamer in the previous world was acknowledged as a low class job in this new world.
Utilizing his knowledge from his previous life as a basis, he then applied unique buffs to his beasts, taking back the ultimate power that he once possessed.
With this power in his hands, he sought to start his life as an adventurer. However...

(Source: Shousetsuka ni Narou, translated)