It's set in a wildland called Azeroth, with liches, witches, demons, and nightmares. You know, fantasy stuff. And what's more fantastical than the Legend of Zelda's main hero, Link NoLastName? What about Link and his Master Sword? Yeah! And both of them are in World of Warcraft in a quest called It's a Secret to Everybody.
Nintendo
After finding a pack with a compass, a map, and a key (the normal things Link needs to find in each mission) along with a photo depicting two gnomes, one who looks exactly like Link and one like Zelda, you find the Link-esque gnome crashed on the shore, wrecking his raft, and getting amnesia which is also the exact beginning of Link's Awakening.Â
Blizzard
He asks you for help to strengthen his sword for a reason he cannot remember, but which eventually is revealed to be so that he can go slay a monster to keep it from taking possession of the "Golden Flame," which has a triangle on it because, of course, it does. After you run around doing chores, including feeding a grumbling Moblin meat (another Zelda questline) and tossing the sword in a lake by a magic person, you can eventually power the sword up, and it becomes Linken's Sword of Mastery.
Or, ya know, the Master Sword. At that, Link-like decides to give up on his quest as you're obviously the destined hero and asks you to slay the monster, which seems like a dick move. Was he just trying to wiggle out his destiny?Â
Eh, the Dragonborn made the sword cooler; maybe they can just do the other parts too! Using a silver totem (like Zelda's silver arrows) to depower the monster, you and your friends can defeat it, but remember, as Link-like tells you before you leave, and the name of the end of the quest repeats: It's Dangerous to Go Alone.Â
Unfortunately, funny jokes that are just remakes of other games aren't "in" for World of Warcraft anymore. After the Cataclysm update, which featured a cataclysm changing the map and world forever (until the next update), Linken's (yeah, that was his name) quest was gone, but Linken is still around, doing Link stuff like, uh ... riding a horse?Â
Blizzard