gistfile1.rb

class Enemy
  SourceUrl = "http://example.com/"

  def self.get_enemies
    open(SourceUrl) { |enemies|
      enemies.lines.map { |line| Enemy.deserialize(line) }
    }
  end

  def self.deserialize(string)
    id, name, attack, defense, hp = *string.split("/")

    new(
      Integer(id, 10),
      name,
      Integer(attack, 10),
      Integer(defense, 10),
      Integer(hp, 10)
    )
  end

  attr_reader :name

  def initialize(id, name, attack, defense, hp)
    @id      = id
    @name    = name
    @attack  = attack
    @defense = defense
    @hp      = hp
  end
end

p *Enemy.get_enemies