Let me get this right, Spell Scars basically allows you to prepare extra spells (assuming you have the time - using scribe scroll rules).
You can either cast them straight off your body and then they're gone, or prepare spells for the day using them as if they were in your spellbook, thus increasing your repertoire.
Is that correct?
Do the scars cost the same as scribe scroll?
Can you prepare a scar at any level you can casts - like a 3rd level shield at 3rd level?
Now...
If one were using the Cabalist archetype where you become a spontaneous caster I assume the spell scars would effectively increase your spells known? or would you only be able to make scars of your known spells?
Also perhaps the scars would still be used up (vanish) if used, effectively increasing your spells known only on the days where you have had time/gold to create them? Or would you be able to keep using them indefinitely until replaced?
Well, considering you're asking how an arcana from a splatbook interacts with a 3pp archetype, I think we're almost veering into homebrew territory here. I mean, the Spell-Scars arcana was not written with the Cabalist archetype in mind, methinks.
Logically, a cabalist should be able to make a spell-scar of any spell he is also able to make a scroll of (or would be, if he had Scribe Scroll). As far as I can tell, creating one of these spell-scars costs and otherwse works exactly like making a scroll, which would include time and money consumed.
Logically, though, I don't think the part of 'preparing spells from spell-scars' would apply to a Cabalist at all, since he doesn't prepare spells. Basically this arcana would just allow him to carry around 18 spell levels' worth of spells that he's created as per Scribe Scroll and then cast them like casting from a scroll.
That's just my interpretation, though. I could be way off here.
Yeah this is a bit homebrew I guess.
18 spell levels even if you can use them as additional spells known isn't all that amazing at high levels. 18 1st level spells looks good but it's only 3 6th level + a 2nd.
They function just as scrolls. So you prepare them ahead of time, costing you gp (as a scroll) and can, at a later time, cast one with a standard action, provoking an AoO. They don't give you increased spells known, as you need to know the spell to make the spell-scar in the first place (like a scroll).
A few interesting things: you don't need to see the scar or hold it in your hand to cast it (but you can't use it with Spellstrike or Spell Combat). Also, you can lower the CL of the spell (as low as the minimum level for that spell, at least) as you're writing it, lowering the cost.
So for 12.5gp you can scratch down a CL1 True Strike that's as useful as a CL20 one.
Anyone else?