I’ve just started reading War of Lanka having just finished he who fights with monsters volume 7 and I came up with this, a group build of things that never existed. It could be a fictional or sci-fi theme, a plane that never got off the drawing board a pure what if, with accompanying story line or a creature or object from literature or fantasy.    Based on the War of Lanka I’m thinking of the Pushpak Viman a prehistoric helicopter, or a dropship from one of Marklo Kloos military sci fi