WARNING: For those of you who have not read the Lone Wolf Gamebooks or Novels... the following post contains some spoilers.
Now that warning is out of the way....
I don't know what the Darklord stats etc have been set for Lone Wolf D20 ( because I don't have the rulebook and such) however I am pretty familiar with the gamebooks and novels...
So let me point out a few things on why Lone Wolf was able to defeat two Darklords ( Darklord Zargarna in Book 2: Fire on the Water & Darklord Haakon in Book 5: Shadow on the Sand ) before he even reached Magnakai level...
First of all Lone Wolf had the Sommerswerd. And we know what a nifty weapon that is to have. In book 2 LW killed Zagarna from long range with a sunbeam attack from the Sommerswerd - so thats one way of killing a Darklord while as a pre-magnakai!
However that still leaves the matter of how Lone Wolf killed Haakon in mortal combat during book 5... so I'll raise this point.
As far as I'm aware from the gamebooks and novels - Darklords are greatly weakened whenever they travel outside of the Darklands. Their formidable powers are substantially reduced the longer they spend outside of their homelands... so when Lone Wolf faced off against Darklord Haakon in mortal combat during book 5 in Vassagonia while seeking the Book of the Magnakai.... and as well as the fact that Lone Wolf had the Sommerswerd too...
Well I'm sure you get the point I'm trying to make.
But like I said - I don't know what the stats of the Darklords are in Lone Wolf D20 - however I assume that what has been provided is what their powers normally are while they are in the Darklands. And not what they are reduced to in their weakened state should they ever find themselves outside and in a nation like Vassagonia or Sommerlund for a protracted period etc etc...
Anyhow thats my take on things though. Could be right.. could be wrong... does anyone really care?