Peltivierre

It was always Elliot's dream to become an Adventurer.
He lacked magic powers to which was why society looked down on him.
His life changed when he was lost in the Forest of Gray Lake, and a book found its way into Elliot's hand. The book was a manual to become strong.
So strong that you could cross the level cap of all adventurers.
A book that contains the secret to surpass level 100.

[ Images on the cover not mine ]

I Know the Secret to Surpass Level 100

The darkness that wrapped around Christina exploded into a giant water-like splash. Each splash of the black aura became an orb was coated with a sphere of spinning water.

She shot the spheres to the Deep Sea Wanderer who in turn roared an fired a strong jet of water. The beast's attack crashed with Christina's. They were exuding so much mana, but there wasn't any struggle in the girl's face.

In fact, if there was anything, she was smiling. This made her friends' to shiver to their bones. This wasn't the sweet young yet wise Christina they knew of. This was a completely different person with a completely different aura.

"This was like when Irus possessed Elliot," Hope thought. He wanted to call the others but decided to report later. They need to win this fight first and Lance was busy with the infiltration.

Deep Sea Pet?