Picked up some Prestige Griffons and Prestige Dragons in a package recently.  Other than the illustration I do not see any benefit to the Prestige troops.  Actually because Prestige troops cannot be darkened they are worse.  When attempting to darken Prestige troops I receive an error that "I do not have the authority to modify darkening privileges".  Can Prestige troops be Darkened and if not other than their artwork what is their benefit?  Screen shots below:

Prestige Griffon

Standard Griffon

Dark Griffon

According to the statistics shown "Prestige" Troops are painted nothing more.  Even the descriptions are not improved.  Please correct me if I am wrong but it appears that "Prestige" troops are worse due to the fact that they cannot be darkened.  There is no way to reduce the food load through darkening