Obsidian and his consort Strika have fought for Cybertron in countless battles... and won them all. Though he is sophisticated and canny, able to concoct strategies with layers upon layers, his purpose is single-minded. He defends Cybertron. While he was pretending to be dumber-even-than-Tankor, his activation code (and, indeed, his entire vocabulary) was "obliterate". He dropped the word when the ruse was over. In an alternate universe, Obsidian was a former Autobot who rose to overthrow Megatron and take over Cybertron, only to be abducted by Unicron to serve as his Minion.