Dueling Zero is a crossover fanfic between Fate/Zero and Yu-Gi-Oh! written by D.N.Works.
The Fourth Holy Grail has come, and Tohsaka Tokiomi was more than ready. With allies and skill by his side, Tokiomi was certain victory was at hand. But fate has changed when instead of the King of Heroes, Tokiomi and the other Masters attain different spirits all together. All starting with a Maiden with Eyes of Blue. Now begins the Fourth Holy Grail War. It's time to duel!
It can be read in Fanfiction.net
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Dueling Zero contains examples of:
- Entertainingly Wrong: When Kiritsugu gets a look at Rider's memories, he sees her world which is ruled by machines while the planet itself is a wasteland. He concludes that this is Earth's future and that humans will keep going to war until their own creations usurps them. Obviosly this is wrong, but to be fair, he didn't know Rider comes from another timeline.
- Godzilla Threshold: After numerous Servants cause devastation in open daylight, the Greater Grail itself summons Ruler just to deal with them. Calling upon Dogmatika Ecclesia, the Virtuous to deal with them. Though later on it's revealed that this was just a ruse by the Wicked Avatar to get more mana.
- Obliviously Evil: The Wicked Gods are this. Despite genuinely wishing to help humanity, they cannot comprehend that their idea of 'good' would only lead to humanity's downfall. Bringing forth an age of anarchy that terrifies Irisviel when she sees what the Wicked Avatar's thought on a good world.
- The Reveal: Chapter 38-39 reveal that the one dwelling inside the Grail isn't Angra Mainyu. It's the Wicked Avatar.
- Unwitting Pawn: As revealed later on, Ruler's summoning wasn't just to deal with the Masters and Servants. It's actually revealed that the Wicked Avatar purposely called on her to use her Noble Phantasm for itself to amass more mana. Ecclesia doesn't take this very well and supports the heroes before she's taken out.
