NCsoft's City of Heroes, Guild Wars and Lineage series are now available through Steam, with NCsoft's next MMO, Aion: The Tower of Eternity, due on it this fall.

"NCsoft is a clear leader in the MMO industry, and we believe our player community will be very excited to have access to the diverse catalog NCsoft has to offer our members," said Valve business development director Jason Holtman.

In celebration, various "special offers" on NCsoft-published titles are said to be hitting Steam across the coming weeks.