Fixten

In a world where summoners wield the power to call forth vampires, elves, angels, demons, and all humanoid creatures from across the realms, Nathan found himself unable to summon beings except from beasts. 

However, those beasts are not ordinary beasts. They are divine beings who once stood at the same level, if not higher, than the legendary creatures the world ever knew. 

Casting his gaze to the left, Nathan sees numerous summoners accompanied by the likes of demon kings, archangels, vampire progenitors, and other legendary beings. Turning to the right, a massive army of alien symbiotes is waiting to attack. 

There was no fear in his eyes, because standing on his left is a majestic wolf who managed to kill a god, the legendary eight-headed serpent coils on his right, above him is the bird who is glowing like the sun, and behind him is a dragon that once gnawed the roots of the world tree. 

“Let the war begin.”

Summoners War: Only I Summoned Divine Beasts

"Are you sure about this?" Vivian asked.

Vivian crossed her arms, wanting to persuade him, but his expression was telling her that no matter what she did, Nathan wouldn't change his mind.

Vivian sighed. "I'll be using herbs that are more potent. This will definitely be painful because it will forcefully stretch your ena veins from the inside.

"Your ena veins might even pop some holes, which will give an unimaginable pain. In addition, Anubis' treatment will give a different kind of pain.

"If we repeat this process four to five times, your ena might expand 50% in size. This should be enough for 10 cores, which means if you swallow the warrior class cores, you are able to do it but experience a hellish pain."

"Can't I just get more herbs to reach 12 cores?" Nathan smiled wryly.

Bath (Bonus)