Funcom MMO Age of Conan: Unchained has reached 600,000 users since going free-to-play in July.
To celebrate this, players will be able to claim a "King's Reward Pack" for free up until November 21.
The reward pack will contain a selection of potions as a way of thanking users for their loyalty to Conan.
300,000 users signed up within the first month of the game's free-to-play released, it was previously reported.
While initially Funcom had plans to bring the game to console, this idea was shelved as it was more complicated than the company had accounted for.