Who is the spiritual host of wickedness?

Do the spirits of the second sphere, who, as you say are banded together, busily engaged hatching evil deeds, have any degree of pleasure or happiness, enticing them to remain in that state?

Yes, the spirits in the second sphere are those who when in the body had pleasure in wickedness. 

As spirits, they are still in the same state. 

With perfect freedom to return, they have too many opportunities of indulging their lawless appetites and passions, deriving thereby as much pleasure now, as when they were in the body, and not only so, but they find delight in inciting mankind to mischief and disorder, bringing in their train misery and ruin to the guilty and innocent alike.

Such unholy deeds have for ages been ascribed to one grand potentate of evil, termed the Devil, but it is not so—these denizens of what is called the second sphere are the devils, and the only devils. 

I believe they find as much delight in their wickedness, as the spirits in my condition find in the practice of goodness and truth.

—Hafed, Prince of Persia