Strewth, a full marathon with 5K of climb and "Medium mountain, possibilities of intense heat, burning sun, strong winds, fog or rain". Not often you see that combination together. And an 8 hour cutoff doesn't sound very generous: if the course record is 3:54 then that's like a 4:10 cutoff for a road marathon.
The prologue has all the hallmarks of a classic BB tale... we await the first instalment. Good to have you back BB!