From publisher blurb:
This installment of Star Log.EM includes: 1,000 words introducing an all-new colossus creature, Deisauryu. Known as the God of Monsters, Deisauryu is a saurian of infathomable size with the ability to unleash atomic bolts from its radioactive body. In addition to a CR 25 stat block and full setting information for Deisauryu, this product also introduces Deisauryu’s CR 25 rival, Mechadeisauryu. Built on the planet Terros in a joint effort between brilliant nashi engineers and Doctor Insano himself, Mechadeisauryu is a robotic approximation of the God of Monsters, armed to the teeth with an assortment of missiles and heavy weaponry. Finally, when all else fails rules are included that allow you to fight Deisauryu in a starship combat, for all the good it’ll do you!