Let's finish his gargantuan and eldritch being. He's gotta be massive but usually still. Praying mantis of ink and tome, his eyes crystallized glass inscripted with the universes before and after. Bright red dots flitter about like a mantises under the crystals. An imposing and predatory looking monster indeed. His arms coiled back as if always reading on his wrists. The mantis slashers forward thingies? a sleek nearly alien metal combined of silver and gold. Heavenly pens capable of writing with cave paint, inks of any color and hue, divine flame(lasers) that can etch memories into crystal or any surface. Even DNA injectors to store information in DNA. Predominantly colored white to black with every gray in between bits angelic silver or gold piping through areas. His chest can heave like inverted books. Pages forever fluttering tk the right passage. Incan knotted ropes dangle all over his immense structure, at the end books of great importance. His chosen "the pages" Buzz around him constantly moving books here or there like some great space station. Cupid like creatures once mortal, they have no feathered wings. They fly as pages on their back ripple swiftly creating an unnerving buzz. Each with a dozen eyes to interpret all scripts infernal to divine from earhly and alien. Four pathetic arms useless except to thumb pages and hold books. Massive stingers, actually syringes of ink for writing. A sting however will add pages to your backstory or rewrite your arc. His pages each were writers who obsessed over the 'art' and 'truth in art.' Certainly famous writers but far more numerous are those who wrote a magnum opus and never had the heart to share. The grandmother's who spent years codifying family trees. The hobbyists with a few great chapters the rest on the tip of their tongue. And of course legal experts and intellectuals. His guts like you mentioned open like doors to reveal infinite reams of knowledge. Vast server farms. One place contains the DNA of every plant and creature who ever existed. It's all just raw data to him. His six quill legs etched with tattoos and scripts divine and diabolical. Chitter on the ground, his wings the quills that flip dangerous inks across the world. Golden heavenly ink, burning orange hellish ink. It's all the same. He craves it. Should you pique his interest you might catch a glimpse forever reeling at the magnitude. If you're foolish enough to seek his true form out you better bring something DAMN interesting. I don't see him as good or evil just a slave to his own force of nature. To teach man such a basis for all technology there must have been something kind under there at somepoint. [Make the eldritch beast described. Large a picture as allowed.]