The Idirans are a formidable species that have risen to dominance on their home planet, Idir, which is teeming with various monstrous creatures. They have adapted and evolved to surpass all other life forms, establishing themselves as the apex species among the diverse monsters inhabiting their world. Their evolutionary journey sets them apart as a unique and powerful race within the context of the story.

This background illustrates the inherent strength and superiority of the Idirans, emphasizing their position as a major player in the larger narrative. Within the universe of "Consider Phlebas," their evolution represents not just physical prowess but also a significant cultural and political status, allowing them to engage in complex interactions with other species and civilizations.