Baal, home world of the Fabulous Space Angel Vampires. Not actually a Bionicle symbol.

Baal is a radioactive wasteland of a Death World, famous for being the home of the Blood Angels, the most badass vampires in history.

The Blood Angels' Primarch, Sanguinius, fell upon Baal Secundus after he and his brother Primarchs were scattered across the galaxy by the machinations of the Chaos Gods.

Baal has two moons, called Baal Primus and Baal Secundus. Apparently, the moons were pretty damn close to some Paradise Worlds, with cultures comparable to High Roman Catholic nations but the Age of Strife slightly altered that. With nukes. The moons' populations now spend their time trying to evolve out of the Stone Age.

Or they did, until the mother of all clusterfucks ensued. Baal Secundus is still more or less intact thanks to the intervention of our Spiritual Liege (and when we say intact we mean "utterly trashed by the nids but extensively terraformed to go back to the days of the paradise moon of ancient times"). It has been terraformed back into its paradisal state before the long night on the order of Robu. Baal Primus, on the other hand, is now completely bereft of life after Ka'Bandha showed up to flip off the Hive Mind.

The Planets, Systems, Regions and Sectors of the Galaxy
Imperial Homeworlds: Holy Terra - Sacred Mars
Primarch Homeworlds: Baal - Barbarus - Caliban - Chemos - Chogoris - Colchis
Cthonia - Deliverance - Fenris - Inwit - Medusa - Nostramo
Nocturne - Nuceria - Olympia - Prospero - Ultramar
Planets: Armageddon - Bakka - Cadia - Catachan - Ganymede
Hydraphur - Krieg - Kronus - Sacris - Sanctuary 101
Scelus - Tanith - Tartarus - Vigilus - Vraks - Zayth
Daemon Worlds: Plague Planet - Sortiarius
Systems and Regions: Ghoul Stars - Halo Zone - Jericho Reach - Kaurava System
Solar System - Stygius Sector - T'au Septs - Taelus System
Types of Worlds: Agri-World - Craftworld - Daemon World - Death World - Eldar World
Forge World - Fortress World - Hive World - Tomb World