World of Warcraft lead systems designer Greg 'Ghostcrawler' Street has left Blizzard to join Riot Games as lead designer.

Street, who will be familiar to any Warcraft fans that follows the development of the game, published the job move on his LinkedIn profile. The update does not however state which project he will be working on.

The move was confirmed by Street over Twitter but he added that he won't be clarifying any more details of his new employment for quite some time. He also posted a confirmation of his departure from Blizzard on the Warcraft forums.

'An opportunity has come my way and I have made the very tough decision to move on from Blizzard,' said Street. 'I wanted to thank all of you for being a part of this grand quest. I have said a hundred times that having passionate gamers, including the angry ones, is a far better place to be than having a community that doesn't care. You all care. Like us, you want the game to be the best that it can be.

Street was well known amongst the World of Warcraft community as a prominent conduit between the community and the development team.

Street had been with Blizzard for nearly six years, joining the company in 2008. Before Blizzard, he worked at Ensemble Studios and was the lead designer on Age of Empires 3.

The Warcraft development team is currently working on Warlords of Draenor, the MMO's sixth expansion which was announced in November 2013. The expansion will take players back in time to before the events of Warcraft 2 and will feature a raised level cap and player-built garrisons.