Hmm...Right. I guess I'll change it to arcane 1/divine 5/theurge 14.
Okay. That way, (coupled with what I changed above), the arcane class would only get 7th level spells, and the divine class wouldn't get 9ths until 19th level.If this wasn't intentional and this class was intended for a 3/3/14 build (which I kind of suspect), I'm not sure how I feel about the full casting. Allowing for a theurgic spellcaster with double 9s is already incredibly powerful (note that the mystic theurge can't do this) even if the arcane class has 3 restricted schools. Creating a class that gives this incredible capability while also giving powerful abilities like undead leadership, larger undead hordes, and lichdom seems a bit over the top. I'd personally recommend removing spellcasting progression from level 1.
Necromancers can already do this with the command undead ability.Also, undead domination seems really, really odd. Consider for a moment that the character may have chosen enchantment as one of his or her 3 prohibited schools, has fewer spell slots for arcane mind-affecting effects thanks to Focused Specialist, and that divine magic doesn't have too many useful mind-affecting effects unless that character chooses the right (necromancy-unrelated) domains. It might be better to create an ability that conscripts undead into the control of the necromancer as if he or she had created them (counting them towards his or her limit).