Possessing the attribute of "thunder", it is one of the Warrior Ten Digimon that saved the Ancient Digital World. An Ultimate who existed only in the distant past, it possesses an appearance fused from many insects such as the Rhinoceros beetle and Stag beetle. Its shell has a hardness rivaling that of Chrome Digizoid, so the falx on both of its arms can cut through anything, and it can easily lift up objects hundreds of times its own weight. Ancient Beatmon's abilities were given to the "Insect" types of Digimon. Its Special Moves are a calamitous thunder which brings about super-disasters (Calamity Thunder), and a super-electrical attack with a thousand times the power of Giga Blaster (Tera Blaster).

“雷”の属性をもつ、古代デジタルワールドを救った伝説の十闘士デジモン。遥か古代に存在した初めての究極体であり、カブトムシやクワガタムシなど多くの昆虫を合わせた様な姿を持つ。クロンデジゾイドに匹敵する硬度な外殻をもち、鎌状の両腕はあらゆる物を切断し、自らの質量の何百倍の物を軽々と持ち上げるパワーを持つ。エンシェントビートモンの能力は、その後“昆虫型デジモン”等へ引き継がれていった。必殺技は超災害をもたらす災厄のイカヅチ『カラミティサンダー』と、ギガブラスターの千倍の超放電攻撃『テラブラスター』。