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Name: Martians
Origin: Demonbane
Classification: Alien race, servant of Master Therion
Age: 20000 years old
Population: Possibly billions (only millions at first considering Mars' size, but their number increase rapidly after conquering Earth's major cities)
K - Level: ~1
Technology/Abilities: Advanded technology, FTL space travel, mass teleportation, interstellar mind and soul manipulation, can turn creatures from other planets into one of them, telepathy, atmospheric entry and anti gravity device, psychometry (powerful to the point where they can control the beings of other worlds without being noticed), regeneration, can take over the bodies of different beings through various means (they stole brains in human cases), they can use their tentacles to connect to their War Machines (like Mobile Trace system), magic, hacking (they took over the entire communations network of humanity in one day), technopathy, forcefield creation, high adaptivity level (they learned and understood steam technology in little time), can use radio as a mean to mindfuck and soulfuck, real War Machine can engage at FTL speed and is even a match to powerful Deus Machinas like Aeon and Goliathe (even a group of fake War Machines already caused enough trouble), energy blasts, possesses at least hundreds of thousands (possibly millions) of fake War Machines and likely at least thousands of real War Machines, dimensional interaction, can live in a vacuum, shapeshifting, heat ray beams
Weaknesses: Will do anything for Master Therion even if they have to sacrifice the whole race, can only adapt in Earth's gravity for a short time and the bodies they possess will eventually rot over time, it seems that their mindfuck and soulfuck technology is limited to waves and sound, Word of God stated even with all of their forces combined, humanity can still defeat them given enough time with only pure technology, not even counting Deus Machina
Industrial Capacity: Can establish bases in every major city they conquered and create many of fake War Machines in one day (in fact they sent hundreds of them to invade Arkham City each day and got driven back by the Hadou Financial Group and the 2 Deus Machinas, Aeon and Goliathe), can make Mars larger than Earth and draw magic circles and signs all around Mars within a few minutes
Holdings: Mars, every major city on Earth
Notable Individuals:

Notable OBD Victories:

Notable OBD Losses:

Other:

Note: These guys was defeated human race of Demonbane in 1900 (if you know what I mean).