Oscar is the only known person to be an Auxiliary Food System Spirit Master with Innate Full Spirit Power. There is a variant nature of his tool spirit, and therefore he was recruited into the Shrek Academy for his uniqueness.

Tang San spent his life in the Tang Outer Sect, dedicated to the creation and mastery of hidden weapons. Once he stole the secret lore of the Inner Sect to reach the pinnacle of his art, his only way out was death. But after throwing himself off the deadly Hell's Peak he was reborn in a different world, the world of Douluo Dalu, a world where every person has a spirit of their own, and those with powerful spirits can practice their spirit power to rise and become Spirit Masters. 
 
The spirit that awakens within Tang San is Blue Silver Grass, a useless spirit. Can he overcome the difficulties to reach the high ranks of Spirit Masters and bring the glory of the Tang Sect into this new world? 
 
(Source: AniDB)

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Tang San spent his prelife in the Tang Clan. He stole the secret from the Inner Clan to reach the peak of martial arts. In the end, he had to commit suicide for such action. Then he was reborn in a different world-Soul Land. This world is filled with powerful soul masters. Each master has their own martial souls. The martial soul of Tang San is a useless Blue Silver Grass. Can he bring the glory of the Tang Clan into this new world? (Source: Webnovel)

The second part of Douluo Dalu.
 
Note: Episodes 27 to 78.

The third part of Douluo Dalu.
 
Note: Episodes 79 to 91.

The twelfth part of Douluo Dalu.
 
Note: Episodes 196 to 208.