Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 15 - 15-14. Hero VS Demon Lord

A mortal teenager strayed into the immortal way because of an accident, struggling on the road of seeking immortality.

Immortal Road is difficult to climb to the sky, in the face of numerous obstacles, his desire to seek the truth is still unabated.

Looking back again, the green mountains are still there, so the old is boneless.

- Description from novelbuddy

Reincarnated without memories, given a second chance as a chimera with a limited lifespan. Leon struggles through his strange new life. He attempts to improve his dungeon and evolve himself to live longer and become the strongest Dungeon Master—no. The Dungeon Overlord.Helped by his Dungeon System: the mysterious Ifrit, Zafira a Level 100 Succubus Queen, and his band of trustee goblins. Leon aims to overcome his limits, survive and reach the pinnacle of the world. Whether through trade, domination, or tricking the hero's beautiful party members into becoming his private mercenaries.Leon will face the weakest and strongest beings in the magical world of Umbra and surpass all!

What is the experience like after transmigrating into the novel’s foreordained miserable cannon fodder?

Su Zui, who had only ever treated other people as cannon fodder, expresses——

Your father is still your father.

Winning just by laying down, system silently gave his family’s host a call: Papa 666.

Boss: Be good. A single parent family isn’t good for the child. Call me papa number two.

System: ???

Even though the roles assigned are all definitely touching and inevitably miserable cannon fodder, this does not hinder Su Zui’s path on oppressing main leads to the point they question their life.

- Description from Novelupdates

I made a deal with the Devil.Free of Charge.