I never prayed to Lucifer. But I light his candle every day because that is what he represents to me: light that enables to see in the dark.
I can't imagine people praying to him and saying they "serve' him, when his story is about NOT serving.
It's because people are deaf, and blind. Often intentionally.
They don't listen, they are just hearing.
They don't see, they are just watching.
I think they're looking for "serving" because it may give them the false feeling that they have less responsibility and freedom what they have to deal with, but even this mindset, is a decision came from free will. It's easier to act like a subordinate rather than like someone who have the power to control their life. But we all have it, we just don't want to accept it. This is the truth, picking up a role will not save us from the consequences neither.
What Lucifer has always told to me and kept remind me when I was working with him is:
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Always trust in your senses and yourself. ''
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Do not surrender yourself to your doubts nor keep turning back to them. It'll drag you back to the same Hell what you've overcome once. ''
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You are powerful and free. ''
He never gave me the vibe of someone who'd thirsts for slaves or subordinates. On the contrary, he had much more of a paternal vibes, radiance and his presence so bright. I often felt treated like an “equal partner” because he was watching my soul, communicating with my soul and not with my ego and it's illusions, expectations.
If you want to approach him with your ego and negative, destructive thoughts, you might get back these as a reflection from him. He can be fair and terrible, just like you or me. Both is natural, both is needed, both is a part of reality and of the Ccosmic Balance.