"magic (specific Essence) in EoH. Where did it come from?"
It's always been there.
"Is it Evil?"
The Church thinks so. At the very least, they think that Mortals can no longer use it without becoming corrupted by it.
"Will it taint the users (taint, corruption)?"
No.
"Thinking that traditional medieval magic is evil and is not of God."
Well, you aren't getting it from God, but he did make everything at one time.
"Re: druids. What role do druids play; priests of the elves or D&dish nature-lovers?"
In RM, I don't think there a current druid profession. Do you mean the atavists? They are what are meant when I refer to druids, but if so, I don't know I understand the question.
"Re: Forces. Do you got a force of nature in EoH. Faerie maybe?"
Again, I don't understand the question. There ARE faeries, if that's what you are asking.
Bounce these back and I'll answer them.