Also, why enter Incantatrix at level seven when you can do it at level six?
Because Steel Legionnaire requires Fort, Reflex, Will +2,
BaB +4. But you are right - updated progression:
Wizard 5/Incantatrix 3/Wizard 1/Steel Legionnaire 1/Legion Sorcerer 3/Incantatrix 4-10
If you don't mind me asking, where are Steel Legionnaire and Legion Sorcerer from?
I don't mind at all - they are definitely both very obscure. Steel Legionnaire is from the DragonLance Campaign Setting. This class doesn't really give anything of value, but it's level 1 ability (something like bardic knowledge), is a pre-req for Legion Sorcerer. Also,it costs a CL. *ouch*
Legion Sorcerer is from Dragonlance - Age of Mortals. Let's you share divination spells with those in 30' at 1st level, and add Casting Att. bonus to punch through SR at 2nd. Other cool abilities too. Nice class - and great for my diviner-themed build.
stuff
I have to agree with StrawMan's position. Also, the question isn't "should I take Incantatrix". The question is "should I take the last 3 levels of Incantatrix".
While the reduction in metamagic cost is great, at that point
you already can persist things for free, etc.
While the last 3 levels are clearly more powerful from Incantatrix, I don't think they make him a more powerful diviner, and they are only slightly more powerful in general.
However, being able to re-roll on divination spells is almost as good as getting 2-for-1 on bread and butter spells.
An example:Casts Echoing Divination spell w/ Circle Magic. CL ~ 40. This divination spell can be cast 9 times from this one 7th level spell slot!
Each of these castings can be shared with all party members in a 30' radius
Each of these castings get's the better of 2 rolls. (If with divine oracle)
And you can do this spontaneously!
You're whole party can know a _whole lot_ from that 1 7th level slot. Similarly with Surge of Fortune, etc.
Best,
David