Darillium was located in a galaxy near the Andromeda Galaxy. The planet had several rings around it and a large number of non-spherical moons. Seen from afar, Darillium had a reddish-brown colouration, likely due to having a largely rocky surface. The atmosphere was breathable as well.

The planet was known for its Singing Towers, a pair of monoliths. Darillium also contained a cave system with a crystal layer. When the wind blew though the caves by the Singing Towers, it would harmonize with the layer and cause a song to be produced, the reason why the monoliths had been named as they were.

Darillium rotated very slowly; in human terms, a night lasted 24 years.