Would you let her? Maybe toughen up the pre-reqs? Is there some sort of Faerunian item like this already?
I don't think you actually need pre-req's for items that give a bonus to skills. Except of course the feat.
Just look at the Elven Cloak and Boots. They gave a +10 bonus to skills and they only cost 2,000gp. Why should Spellcraft be any different? The formula for calculating the cost of a skill bonus enchantment in 3.0 is bonus sq. X 20gp. In 3.5 it is bonus sq. X 100gp. So, that's 2,000gp or 10,000gp. 2,000gp may or may not seem too cheap, but 10,000gp is definitely way too expensive.
The epic item shouldn't even be discussed since that's nowhere near a similar item. You're not doing anything with epic spells and epic spells and magic items have their own set of rules.
However, it seems like what you're wanting to do is just cheese through the rolls necessary to do your class powers. At 16th level, you should have Spellcraft at +19. Your Int is probably at least 20, or should be, so that should give you at least another +5. So, barring any other modifiers to Spellcraft, your checks are at least D20+24. You're wanting to make an item to pretty much give you automatic, or darn close to it, success any time you use an Incant. power. And since that use of Spellcraft is unique to that class afaik I would rule that a simple Spellcraft boosting item like that wouldn't work or not that well. I'd limit your bonus for an item doing that to maybe +5, but still cost as much as if it were a +10 bonus.
You should have to work to do those things as an Incant. and there should be a chance of failure, instead of getting an item that would let you coast through almost every roll and a +34 (+24 from above and +10 you are wanting) bonus to your checks would let you coast through almost any use of Incant. powers requiring a roll.
so if i make a +6 Sword with giving a +2 bonus to strenght.. the item is epic, (the +6 makes sure of that)
Do you mean +6 bonus to hit/damage? Or just total +6 enhancement bonus? It's only epic if the attack/damage bonus is +6. And it would be more cost effective to just have a +5 attack/damage bonus. Knocking the cost up by over half a million gp just for one more point to attack/damage is ludicrous. Adding +2 Strength would be the same as adding the cost to any non-slot item. That would cost 8,000gp: 4,000gp for +2 ability bonus, X2 for non-slot item (and weapons and armor are non-slot items).
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