Fixed some issues

`require 'nokogiri'
require 'faraday'
require 'date'
require 'digest'
require 'fileutils'

class Ward

BASE = 'https://www.parahumans.net'

class Page

attr_reader :title, :content

def initialize(title, content)
  @title = title
  @content = content
end

end

class Loader

def get(url)
  cache = "cache/#{Digest::MD5.hexdigest(url)}"
  if(File.exist?(cache))
    body = File.read(cache)
  else   
    res = Faraday.get(url)
    raise "Get #{url} failed: #{res.status}" unless res.success?
    body = res.body
    FileUtils.mkdir_p(File.dirname(cache))
    File.write(cache, body)
  end
  return parse(body)
end

def parse(html)
  doc = Nokogiri::HTML(html)
  title = doc.css('main article header.entry-header h1.entry-title').text
  content = doc.css('main article div.entry-content')
  content.css('.sharedaddy').remove      
  content.css('p').first.remove
  content.css('p').last.remove
  content.css('a, span').each { |node| node.replace(node.children) }
  content.css('em').each { |node| node.name = 'emphasis' }
  content.xpath('//@style').remove
  Page.new(title, content.inner_html)
end

end

class Book

def initialize(pages = [])
  @pages = pages
end

def generate(filename)
  doc = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml|
    xml.FictionBook(xmlns: 'http://www.gribuser.ru/xml/fictionbook/2.0', 'xmlns:l' => 'http://www.w3.org/1999/xlink') {
      xml.description {
        xml.send('title-info') {
          xml.author {
            xml.send 'first-name', 'John Charles'
            xml.send 'last-name', 'McCrae'
          }
          xml.send 'book-title', 'Ward'
          xml.annotation {
            xml.p 'The unwritten rules that govern the fights and outright wars between ‘capes’ have been amended: everyone gets their second chance.  It’s an uneasy thing to come to terms with when notorious supervillains and even monsters are playing at being hero.  The world ended two years ago, and as humanity straddles the old world and the new, there aren’t records, witnesses, or facilities to answer the villains’ past actions in the present.  One of many compromises, uneasy truces and deceptions that are starting to splinter as humanity rebuilds.'
            xml.p 'None feel the injustice of this new status quo or the lack of established footing more than the past residents of the parahuman asylums.  The facilities hosted parahumans and their victims, but the facilities are ruined or gone; one of many fragile ex-patients is left to find a place in a fractured world.  She’s perhaps the person least suited to have anything to do with this tenuous peace or to stand alongside these false heroes.  She’s put in a position to make the decision: will she compromise to help forge what they call, with dark sentiment, a second golden age?  Or will she stand tall as a gilded dark age dawns?'
          }
          xml.lang 'en'    
        }
        xml.send('document-info') {
          xml.author {
            xml.nickname 'Cuterebra'
          }
          xml.send 'program-used', 'Ruby, Faraday, Nokogiri'
          xml.date(Date.today, value: Date.today)              
          xml.id 'fbab61de-f08a-4763-88f8-7b3808e153d0'
          xml.send 'src-url', BASE 
        }
      }
      xml.body {  
        @pages.each do |page|
          xml.section do |section|
            section.title page.title
            section << page.content
          end
        end
      }
    }
  end
  File.write(filename, doc.to_xml)
end

end

def contents
res = Faraday.get(BASE)
doc = Nokogiri::HTML(res.body)
urls = (links(doc.css('aside #nav_menu-5')) + links(doc.css('aside #nav_menu-6'))).uniq.reject{|url| url.include?('category/story')}
urls
end

def links(node)
node.css('a').map{|a| a.attr(:href)}
end

def create_book(filename)
print 'Getting contents...', $/
urls = contents
pages = []
loader = Loader.new
urls.each do |url|
print "Reading #{url}", $/
pages << loader.get(url)
end
print 'Generating book', $/
book = Ward::Book.new(pages)
book.generate(filename)
end

end

ward = Ward.new
ward.create_book('ward.fb2')
`

One more fix with forum name corrected
`require 'nokogiri'
require 'faraday'
require 'date'
require 'digest'
require 'fileutils'

class Ward

BASE = 'https://www.parahumans.net'

class Page

attr_reader :title, :content

def initialize(title, content)
  @title = title
  @content = content
end

end

class Loader

def get(url)
  cache = "cache/#{Digest::MD5.hexdigest(url)}"
  if File.exist?(cache)
    body = File.read(cache)
  else
    res = Faraday.get(url)
    raise "Get #{url} failed: #{res.status}" unless res.success?
    body = res.body
    FileUtils.mkdir_p(File.dirname(cache))
    File.write(cache, body)
  end
  return parse(body)
end

def parse(html)
  doc = Nokogiri::HTML(html)
  title = doc.css('main article header.entry-header h1.entry-title').text
  content = doc.css('main article div.entry-content')
  content.css('.sharedaddy').remove      
  content.css('p').first.remove
  content.css('p').last.remove
  
  # Декодируем Cloudflare Email Protection
  content.css('.__cf_email__').each do |cf_email|
    encoded = cf_email['data-cfemail']
    next unless encoded
    decoded = decode_cf_email(encoded)
    cf_email.replace(decoded) if decoded
  end
  
  # Удаляем оставшиеся email-защитные обертки
  content.css('a[data-cfemail]').each do |link|
    encoded = link['data-cfemail']
    next unless encoded
    decoded = decode_cf_email(encoded)
    link.replace(decoded) if decoded
  end
  
  # Удаляем ненужные теги
  content.css('a, span').each { |node| node.replace(node.children) }
  content.css('em').each { |node| node.name = 'emphasis' }
  content.xpath('//@style').remove
  
  # Защищаем оставшиеся @ в тексте
  html_content = content.inner_html.gsub('@', '@')
  
  Page.new(title, html_content)
end

private

# Правильное декодирование Cloudflare Email Protection
def decode_cf_email(encoded)
  key = encoded[0..1].to_i(16)
  decoded = ""
  (2...encoded.length).step(2) do |i|
    hex = encoded[i..i+1]
    char_code = hex.to_i(16) ^ key
    decoded << char_code.chr
  end
  decoded
rescue
  nil
end

end

class Book

def initialize(pages = [])
  @pages = pages
end

def generate(filename)
  doc = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml|
    xml.FictionBook(xmlns: 'http://www.gribuser.ru/xml/fictionbook/2.0', 'xmlns:l' => 'http://www.w3.org/1999/xlink') {
      xml.description {
        xml.send('title-info') {
          xml.author {
            xml.send 'first-name', 'John Charles'
            xml.send 'last-name', 'McCrae'
          }
          xml.send 'book-title', 'Ward'
          xml.annotation {
            xml.p 'The unwritten rules that govern the fights and outright wars between ‘capes’ have been amended: everyone gets their second chance.  It’s an uneasy thing to come to terms with when notorious supervillains and even monsters are playing at being hero.  The world ended two years ago, and as humanity straddles the old world and the new, there aren’t records, witnesses, or facilities to answer the villains’ past actions in the present.  One of many compromises, uneasy truces and deceptions that are starting to splinter as humanity rebuilds.'
            xml.p 'None feel the injustice of this new status quo or the lack of established footing more than the past residents of the parahuman asylums.  The facilities hosted parahumans and their victims, but the facilities are ruined or gone; one of many fragile ex-patients is left to find a place in a fractured world.  She’s perhaps the person least suited to have anything to do with this tenuous peace or to stand alongside these false heroes.  She’s put in a position to make the decision: will she compromise to help forge what they call, with dark sentiment, a second golden age?  Or will she stand tall as a gilded dark age dawns?'
          }
          xml.lang 'en'    
        }
        xml.send('document-info') {
          xml.author {
            xml.nickname 'Cuterebra'
          }
          xml.send 'program-used', 'Ruby, Faraday, Nokogiri'
          xml.date(Date.today, value: Date.today)              
          xml.id 'fbab61de-f08a-4763-88f8-7b3808e153d0'
          xml.send 'src-url', BASE 
        }
      }
      xml.body {  
        @pages.each do |page|
          xml.section do |section|
            section.title page.title
            section << page.content
          end
        end
      }
    }
  end
  File.write(filename, doc.to_xml)
end

end

def contents
res = Faraday.get(BASE)
doc = Nokogiri::HTML(res.body)
urls = (links(doc.css('aside #nav_menu-5')) + links(doc.css('aside #nav_menu-6'))).uniq.reject{|url| url.include?('category/story')}
urls
end

def links(node)
node.css('a').map{|a| a.attr(:href)}
end

def create_book(filename)
print 'Getting contents...', $/
urls = contents
pages = []
loader = Loader.new
urls.each do |url|
print "Reading #{url}", $/
pages << loader.get(url)
end
print 'Generating book', $/
book = Ward::Book.new(pages)
book.generate(filename)
end

end

ward = Ward.new
ward.create_book('ward.fb2')`