Not a lot is known for sure about this Slavic deity:
His name means black god, about whom much has been speculated. The only historical sources, which are Christian ones, Unfortunately :( Christians Interpret him as a dark, accursed god.
The name is attested mainly in the West Slavic region. A Sledge Hammer or mighty Hammer similar to the God Thor was his powerful weapon. This represented power and strength among the Slavs.
He has a opposite unknown if he is an actual Brother Belobog, God of the Light.
While little might be known about this mighty God of the Slavs.
For sure he is a God of Strength and Courage. A true God to gain Inspiration for Men to grow stronger.
Being the God of the Dark also pushes his stories toward a Lord of the underworld.
Either way "Darkness brings great strength"
Take great honour and spare a prayer for this great God of the forgotten world!
CG