They are cards without a printed clan, but a nation's name instead, which makes them belong to the clans from that nation. In the anime, they are used by Gyze's Apostles, each of them corresponding to the respective nation of their decks. They also share the symbol called the 'Mark of Gyze' (on the top of the head for Meggido, Drachma and Zoa, the chest on Dust, the back of Stark and the sword of Ultima). The apostles of Gyze plan to use these dragons to revive him, bringing Planet Cray into an era of destruction and chaos by trying to defeat the Messiah. The Zeroth Dragons are weapons of mass destruction born from the Dragon Deity of Destruction, Gyze. 'Zeroth Dragon' (ゼロスドラゴン Zerosu Doragon) is a race featured on one card of each nation, and introduced in G Booster Set 13: Ultimate Stride.
The Zeroth Dragons before Chronojet Dragon G from Jo no Ka opening
