Power of Darkness is a demonstration album by the music production group Two Steps from Hell, originally released exclusively to clients in the motion picture and advertising industry for the purpose of licensing in March 2010. It was uniquely distributed on a flash drive, rather than a physical disc. It includes 32 principal tracks, split into two themed volumes. Additionally, it contains a large collection of alternative versions; therefore, in total, Power of Darkness consists of 77 tracks. They are composed by Thomas J. Bergersen and Nick Phoenix. The album was recorded in Prague, Czech Republic, in Los Angeles, and in Utah, United States. The cover artwork and the sleeve are designed by Steven R. Gilmore.

Invincible is the first public album by the group Two Steps From Hell, released in May 2010. It consists of 22 tracks written by composers Thomas J. Bergersen and Nick Phoenix. The tracks are a collection of fan favourites from prior demonstration albums previously only available to the industry, "represent[ing] the very best of Thomas and Nick’s first few years at Two Steps From Hell". Two tracks, however, are brand new compositions.