Hierophant
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The Hierophant is a Forge World-only fuckhuge Tyranid biotitan which is a fucking engine of destruction. It has a large arsenal of bio-weapons and is the Tyranid response to Gargants and Titans. The largest Tyranid unit in the game it stands at 10 inches without a stand. However in the fluff it is 15 metres tall. Which is about the same size, ignoring how stupidly huge Guardsmen and Tau are Space Marines and Eldar would stand about 1.5" if they were standing up straight and are about 2 metres so on the table you can expect the size difference between a Hierophant and most things to be approximately fluff accurate, in other words it's fucking huge.
They also weigh at around 51 tonnes, which in real world terms is not actually that massive. Compared to many sauropod dinosaurs (not to mention things like tanks), this is rather light.
With that in mind, the Heirophant is probably not all that dense. Creatures that large have a high tendency to crush themselves, and for the Hive mind to create a creature that can only invade Earth-sized or smaller worlds would be a waste of time. Instead of being a huge brick like a Carnifex, the Heirophant is probably light for its size, armored and structured in a self-supporting way to enable it to take cannon shells without breaking bones or splitting armor. Purely speculation, but one could assume it has legs made entirely of hard chitin or whatever the Tryanids use for armor, with muscle and bone only extending far enough to give mobility and reinforcing structure. The inside of the beast would most likely be entirely metabolic structures and weapon organs (standard Tyranid fare), but with a dense and powerful digestive system in the lower front area to take in energy. The supportive structure is likely a porous, hard (and regenerative) supporting material with a dense bone-core and plated chitin armor, segmented like an insect. The odd shape of the body probably protects vitals from infantry, smaller beasts, and flame weapons; it can walk over barricades and could even use it's circulatory system to move heat generated from movement or energy weapons to it's top, ensuring weapons organs function at peak efficiency.