Lord Kubera is well known to every one. Very few people would be unware of his fame. By Chanting his name again and again, prosperous life will result.
Lord Kubera is the leader of "Yatchas" he is the very best among them. Many people do not know that there is a difference between "Yatchas" and "Bhoothaganas". Rakshas of shiva are semidivine gods and their devotees are "Bhoothaganas".
"Yatchas" are there to help mankind and procure wealth. They plead with the Lord for the betterment of good people and the created to help devotees.
Kubera is one of the "Yatchas" he was very much devoted to Shiva. He performed severe penance invoking the blessing of Shiva. He impressed Shiva with his immense Bhakthi and relentless efforts.