At the moment the eldritch scion is just a band aid for a class many (or at least me) wished for. I realy hope that paizo updates the class/archetype/Book in a timely fashion.
But i am almost certain they added the archetype at the last minute.
My biggest offenders with the archetype are.
-1 Arcane pool point for 2 rounds, all things considered, is silly for a class that can have/use so many swift actions. And most costs points too. So, depending on your bloodline, you will use most if not all your points just to activate your bloodline powers and avoid arcana/feats that costs swift action/points. Or you kind of "avoid" your Bloodline. But then except for seriously waked roleplay reasons there is no point in picking this archtype.
I would like to see a base mystic fokus pool of charisma mod + half class level (or maybe every fourth class lvl) and the option as a swift action to spend a number of arcane pool points(more then one at a time) to get extra rounds, every points spend adds 2 rounds to the pool. Considering you get no other benefits from rage then the activation of your bloodline abilitys and this could includes even the normaly for the bloodrager constant ones, i seriously doubt this is even close to overpowered.
This way MAYBE they could have consider the other way around (rage for arcane) as a high lvl archetype/class feature, but to be fair, it sounds and is overpowered at least if they not nerf the ratio hard.
Yes this COULD double your pool but half of it would only be used for your bloodline and this way you are not out of "ammo" so ridiculous fast.
Just as a reminder the bloodrager gets 4 + con mod + 2 per lvl after 1lvl.
As it playes now, it feels like they replaced arcana with a gutted and bandaided rage. Except for the bloodlines.
As it is now, i would take a weaker version of real bloodrage in place of arcana i dont have the pool to support anyway.
-At the very least consider making this a free action and/or up the rounds. Yes as a free action you will plow through your resources even faster but at least you can/wlll play some kind of a shotgun character...in close range.... with one shot.
-The archetype/book is plaqued with errors.
as examples the posts above mine or these ones:
Bonus Spells
At 7th level, an eldritch scion gains the bonus spell from his bloodrager bloodline that is normally gained at 10th level. He gains the next three bonus spells from his bloodline at 9th, 11th, and 13th levels, respectively
ok understandable but just as example here the bonus spells from draconic bloodline.
Bonus Spells:
Shield (7th), resist energy (10th), fly (13th), fear (16th)
know let the confusion begin!......
.... yea i am not stupid, mostly likely the intend was that you get the later spells sooner, but if you play it like it is written where do you get your 7lvl spell? after the 10lvl spell or is it now the last in line? Or nothing, because there is no 5 spell in any bloodline.
And an other one, are the bloodline abilitys that are constant for the bloodrager also constant for the Eldritch Scion?
And what personaly grinds my gears.
-The magus skillpoints per lvl (2+int mod) is mostly likely balanced around the fact that he is a int caster class to begin with, with this archetype he doesnt need int that much so his skill points should go up to 4 +int mod. I bet, with all the other errors etc. with the book, this was an oversight.
I seriously dont believe they expect me to put points into int, too. The archetype/class is mad enough as it is.
-Carrying on with the Bloodline theme paizo should have strongly considered giving it "eschew materials" as a bonus feat.
-that i need the Spontaneous Metafocus feat to metamagic a spell with spellcombat now.
And no, i dont consider bandaiding serious flaws in the archetype with heavy investment in feats and/or maybe even arcana, good practice.
And yes i hate it and i will play it anyway just because there is no other option then 3rd party for this type of class.
I seriously dont want to sound ungrateful and i apologies if it sounds that way, but i wished for the class/archetype and now that is here it walks on crutches.
On a side note i hate that there is no "good" necromancer possible, i like the white necromancer but its 3rd party.