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Name: Grendan, The Proto Lance Shelled Regios of Grendan
Origin: Chrome Shelled Regios
Age: Unknown, at least hundreds of years (almost as old as the Regios world)
Classification: Self-supporting Mobile City, Last Frontier against Ignasis
Population: Hundreds of thousands of citizens, about ten thousands of Military Artists
Leader(s): Queen Alsherya Almonise (city ruler), Grendan (electronic spirit and the heart of the city), Saya (the creator of the Regios world)
Center of Operations: Royal Palace, Mechanical Department (for the spirit Grendan)
Technologies/Abilities: The city is able to move on its 6 spider-like legs,ability to detect any threats above the ground for a range of hundreds of kilometers, protective bubble against hazardous environment, artificial life sustenance and ecosystem, matter manipulation which allows quick food production, weapon manufacture, construction and repairs, medical technology that can heal any injury with the exception of the brain in a single night, has an army of fighters with Kei powers (notably the best in their verse), has a cadre of 12 elite combatants with massive powers (plus the Queen herself), two Mutants with reality warping abilities
Weaknesses: The city cannot operate without a regular supply of Selenium (fictional energy fuel). Losing its Electronic Spirit, Grendan, would disable the entire city.
Holdings/Authority: In possession of unknown number of Selenium Mines
Finances/Industrial Capacity: Much higher than Zuellni's production rate
Affiliated Groups: Heaven Blade Successors, Salivan Mercenary Guidance Gang
Notable Members:

- Barmelin "Swattice" Nolne
- Cauntia Valmon Falnes
- Claribel Ronsimer
- Delbone Quantis Myura (KIA)
- Elsmau Quantis Foa (formerly known as Fermaus)
- Haia Salinvan Laia
- Kalvan "Geodeus" Midknot
- Kanaris Aerifos Rivin
- Haia Wolfstein Laia
- Layfon Alseif (expelled)
- Leerin Eutnohl (formerly known as Leerin Marfes)
- Lintence Haden
- Reverse "Ilginas" Elmen
- Ruimei "Garrant" McRing
- Saya
- Savaris Luckens
- Tigris Norian Ronsimer (KIA)
- Troiatte "Ganabest" Firandin

Notable OBD Victories:

- The Joint Shinobi Alliance, Soul Society and Marineford (Bleach, Naruto, One Piece) - The OP title said the Grendan vs the HST but this was the real scenario

Notable OBD Loses:

Other: