Lucifer is at the bottom of every encounter table in Albion. He is in the streets and in the dungeons, in parlors and tombs and dreams. He is unfathomably evil and incalculably powerful, but not all that difficult to deal with. Lucifer is the architect of human sin and warden of every wicked soul to ever die; the idea of wanton destruction for its own pleasure lost its luster several epochs ago. Ultimately, Lucifer is bored; he is possibly the most bored being in existence. He responds well to the amusing and poorly to the tedious, and will grant a Wish to either if he thinks the results will be interesting enough. When encountered in the field, he will converse and observe, but not intervene; however, he will often agree to officiate or judge contests and wagers.
Lucifer has stats as a Baalroch/Balrog/Balor and can cast Wish at another's behest. In normal circumstances, he wears fine white clothes and possesses the wings of a bat. In a fight, he is as large as is convenient, though never bigger than a storm giant, and appears as an armored man bathed in excruciating actinic radiance.
His incarnation can be destroyed for a time, but killing him in truth, if it is even possible, requires a great deal more than a simple fight. A player whose character makes a deal with Lucifer can henceforth choose Cleric of Lucifer as the class of new characters, even if the original deal-making character died.
Clerics of Lucifer cannot cast reversed Cleric spells. They can Turn Undead as normal, allowing their patron to reclaim the fugitive souls of the damned. Their only commandment is Don't Be Boring.