Well, basically, with the way minions work, it's generally better if your highest-level minion is a bit lower in level.  It starts off by determining the total number of slots you get, and the way that works is that the amount increases exponentially the lower you go.  So, you could get 1 CR 26 minion, or 2 CR 25 minions, or 4 CR 24 minions, and so on.<br/><br/>Then, if you want more minions at an even lower CR, it goes from exponential progression to just a flat +5 for every point of CR below the maximum.  I think there's a link in the House Rules thread to a post where I give a better example for it.<br/><br/>Basically, to give an example, if you forgot about raw combat ability and just replaced your daughters' Paragon Creature template with Vecna-Blooded, dropping them from CR 22 to CR 8, you'd be able to have 12 of them and well over a million Succubi, on top of that.  They wouldn't be as personally powerful, but I could easily see Sahariel letting you upgrade them with your soul points, if a suitable price could be worked out.  And you would have a ridiculous amount of souls to spend, so you could certainly afford it. ^^;