Allow you to use metin2 yang all of the "cool toys".

Engineering is the profession that will allow you to use metin2 yang all of the "cool toys". Yes it is expensive to level. Yes, another profession may help you get further in PvE, but it is one of the coolest professions to have.
Engineers get access to everything from Rocket Launchers, to Death-rays, to Shrink-rays, to little gadgets that turn other players into chickens (I mean, how cool that is!). Did someone on your team die? Use Jumper Cables to resurrect them!
Are you deep in an instance and need to repair your gear? Drop a repair bot! For the player that just needs to have cool tricks up their sleeve, Engineering is the way to go.
This is just a nice quick overview to increase your engineering skill. For an in-depth guide that also includes gold making as well, take a look at this WoW profession guide. This class was only available to three Horde races, the Orcs, Trolls, and the Tauren since the Alliance had the Paladin.At skill level 200 an Engineer can choose whether they want to specialize in Goblin Engineering or Gnomish Engineering.