Nifft
Penguin Herder
Take a look at the duration of dominate person and I think you'll agree no such PrC is necessary for the specialist Enchanter with a high save DC.Yeah, I know - but I want to have the enchanter's minions be better because they are a)...you know...enchanted! or b) because they are not normally minions but are forced to be by the enchanter.
Those may sound the same but I guess a benefit of a prestige class is what I'm talking about regarding point a.
Figure out how many dudes he can keep constantly dominated, factoring in how many spell-slots he wants to keep available to handle surprises (like adventurers). IMHO it should be roughly 2x his level -- costing him two or three spell-slots per day as he makes his rounds, renewing the domination effect on his special friends.
Cheers, -- N