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Since you did say "any genre" ...
The only thing I have of that size is The Bible. It fits your "intimidating" requirement (for many people at least), but might fail on your "no classics" requirement, depending on your thoughts on religion.
Another one that I have that is not quite 800 pages, but getting close is The Ashley Book Of Knots. Known in knot tying circles as "ABOK". Knots are numbered, e.g., the simple "Square Knot" is ABOK #1402. There is general text, knot descriptions, and tons of hand drawn illustrations. Intimidating, yes. It's quite the tome. A classic? In the knot tying world - yes, outside of that group - probably totally unknown.
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