I've been searching around, but I haven't been to find what I'm looking for via Google queries; but I presume that what I'm attempting would be pretty common.
Anyhow, are there any resources that would help me "convert"/"scale up" a character (created via the player character creation mechanisms) to be a villain or boss of some sort? Is there a simple heuristic where I can just plug in a few parameters and get some sort of output?
For instance if I have a party of X players and the party level is Y and I want the villain to be combat level Z, what should I do to meet those parameters? If concrete hypothetical numbers are helpful, let's say a party of size 5, a party level of 4, and I want the villain to be roughly equivalent to a combat level 6 creature.
If no official rules/guidance materials exist, I'm happy to hear of any techniques people have used to create villains with a character class.