the "tomb raider" series' popularity began to stagnate in the early 2000s and dropped after the critical and commercial failure of "". core design was sold to rebellion developments, and development of the "tomb raider" series was handed to crystal dynamics, best known for "legacy of kain". "" was released in 2006, the story focused on the mythological king arthur and the legendary excalibur. the game started a new timeline with a different incarnation of lara croft. the game became critically and commercially successful, selling 4.5 million units.