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The track primarily utilizes synthesizers and vocals in its composition. The song has vocalizations delivered in a somber manner alongside powerful percussion and guitar strings, representing the tragedy of Samus Aran being forced to fight her comrade Rundas due to the latter succumbing to Terminal Corruption.
A remixed version of Theme of Rundas is integrated into the theme of the Metroid Prime Trilogy. The trailer for Trilogy uses the original Theme of Rundas for its portion containing Corruption footage.
Theme of Rundas is included in the Samus Archives Sound Selection, the soundtrack CD included with the Special Edition of Metroid: Samus Returns. This track opens with Rundas-mae, the theme heard during the previous encounters with Rundas, and then transitions to the battle theme.
Theme of Rundas can be heard here: 
- Prior to the battle, Rundas also has his own theme music, which is heard in all of his appearances up until the point where he attacks Samus. This feature is unique to Rundas.