Hmmm, considering Aren's situation and quote I made, would Suel Arcanamach (http://dndtools.eu/classes/suel-arcanamach/) be better choice for PrC? Aren is build for the PrC quite well as he got astounding charisma already. But it means unlikely Aren enters Sanctified One (perhaps after 20th level). So his build would change quite bit; he would take firstly 2 more levels as marshal (for auras and grant move action). But then take one level as barbarian and then enter PrC at 8th level. To enter it Aren would need either find mentor (but 90% of them are Scarlet Brotherhood guys) or find<em>Grimoire Arcanamacha</em>(which is up to GM's judgment and doing so marks Aren for assassination by Scarlet Brotherhood if they find out he practices that ancient craft, or would bully him join the brotherhood as he shows strong suel heritage).