This is honestly weird because it has a lot of things it can pull off and it's not hard have one of these lead a small army even straight out of the box, but it doesn't really scale and worse, undead-based minionmancy kinda drops off pretty fast and hard from what I hear.

Also regarding the flight: there's an evolved Atropal Scion in Elder Evils and it has the flight listed as good mobility. It's kind of odd though; the CL of the SLAs are all at level 20 and the DCs seem to be Cha-based(which goes against what Debrata said about them being Int-based, though it's probably the Book of Bad Latin also having a bad problem with typos IMO).