Sixteenth Basket of Mantaos

Imagine being forced to live, after death, as incorporeal bodies trapped in a vast space of nothingness for thousands of years, with nothing to do but exchanging past memories with other cohabitants (read: weirdos).  Everybody wanted out, but there was no way to leave the Void... 
Until one day, a young man was finally summoned, as a powerful but reluctant mentor, by a bubbly and motivated but completely naive young girl. Baiyi, finally out of the Void, was the only one who could save all of the other 32 souls from their prison and his summoner might just be The Key to their freedom.
However, Baiyi had to use the techniques and abilities the other souls had taught him throughout the years, and together with his own extensive knowledge of anime and game tropes from his shady and dangerous past as an otaku, to face the biggest challenge of them all: training the clumsy young girl he was forced to partner up with… into a competent sorcerer!

EndlessFantasy Translation 

Why Did You Summon Me？

Sometimes, epic showdowns inevitably left lots of loose ends to tie, but Baiyi did not let them dampen his surging morale. He strutted to the remains of the giant eyeball, which had been incinerated to black residue by the green flames. The black residue had formed a small hill taller than an adult man, resembling a dumpster pile waiting to be burned.

With a casual wave of his hand, Baiyi got rid of the flames. Then, he stuck his arm into the black hill and began to dig, and soon, he pulled out a very hard object. It was… a huge rock.

He chanted the incantation for a wind spell, and a light breeze blew away all the ashes on the rock. He realized that the black rock was larger than his own head. Its shape was irregular, and its surface was riddled with bumps; in short, it was a really ugly chunk of rock.

389. His First Battle Reward