The phrase "monstrous machine" refers to a large and powerful device or contraption that is both scary and impressive. It suggests something that is so big and complex that it can be quite intimidating to look at or operate. Full definition
I've used one for decades instead of the alternative huge monstrous machine. (ourpaleolife.com)
When it comes to gaming, hardcore gamers have many choice from gaming console to PC gaming on monstrous machines with stylish designs. (gadgetguide4u.com)
HZD is an Action RPG, which is my absolute favorite genre of video games (JRPGs are a close second), set in a post-apocalyptic world that finds you essentially on your own against monstrous machines, with multiple ways in which to defeat them. (tmrzoo.com)