Meeting those devoted to World of Warcraft

In the World of Warcraft, players from around the world interact with each other's avatars in a role-playing game where elves and trolls, warlocks and humans battle to survive.

It's a fantasy world, but once a year the most devoted players get together at a convention called BlizzCon and often meet each other in real life for the first time.

The BBC went to 'BlizzCon' and asked gamers what it's like meeting in real life and what it is about the World of Warcraft which inspires such devotion ten years after the game was created.