Zaydas

IF... Sirzechs Lucifer had a child with a human and lived as a common Devil, while hiding his true identity from his own son?

On his 18th birthday, Zaydas Grimmory recalls his past life, uncovering various truths about the world and himself.

"Am I Sirzechs Lucifer's son?"

The new identity as a potential descendant of the Gremory Clan — one of the most powerful Devil clans in the Underworld — takes him by surprise, especially upon discovering he had lived a past life and that this world was written as a "light novel" story.

His father, Sirzechs Grimmory... or rather, Sirzechs Lucifer, went to great lengths to hide his true identity, even avoiding any kind of danger while they lived with his mother, Zatanna, in the human world.

Worried about the future, Zaydas freezes upon waking up the next morning — that's when a mysterious system binds itself to him.

[Welcome to the Conquest System, Host Zaydas. Being chosen by the Conquest System grants the Host a [Beginner’s Package]. Would you like to open it now?]

Zaydas accepted.

[Alert! Congratulations, Host! You have received the unique and powerful ability: [Dimensional Leap] and 500 Achievement Points!]

It doesn’t take long for a more detailed introduction to appear, explaining everything he needs to know about the Conquest System.

‘To earn Achievement Points (AP), I just need to do something worth recording?’

With that, the greatest disaster for some and the greatest blessing for others begins! Zaydas, leaping between worlds, achieves unimaginable feats and becomes increasingly powerful, shaking the DxD world and other dimensions.

Two siblings freezing in winter? Zaydas is there.

A greedy man oppressing his people? Zaydas is there.

A cry for help? A bit cliché, isn’t it? But Zaydas is there too!

Amassing a large amount of AP, Zaydas seeks to conquer everything he desires. Villain, hero? No. He is neither. He’s just someone who follows his heart and does whatever he pleases, without regrets.

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What to expect:

•	DxD/Multiverse.
•	OP MC from the start, getting even stronger as the story progresses.
•	A playful MC with a serious side.
•	His impact on the DxD world and other dimensions.
•	Reactions from people in other worlds because of his achievements.
•	Rankings.
•	Well-planned conquest challenges.

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THE LEGENDARY TRAVELER WITH SYSTEM (DxD/Multiverse)

Father of Zaydas: Sirzechs Lucifer

For now, older sister / maid: Grayfia Lucifuge

Queen of Rias Gremory's Peerage: Akeno Himejima

Rook of Rias Gremory's Peerage: Koneko Toujou

Knight of Rias Gremory's Peerage: Yuuto Kiba

Isekai Nonbiri Nouka: Hiraku Machio

Bishop of Rias Gremory's Peerage: Gasper Vladi

Well, if I forgot someone, let me know, and I'll introduce them gradually.

Images of the relevant characters introduced in the fanfic so far