Crafting a Ring of Swarming Stabs

[Shadenir]

How do I calculate the cost of crafting a Ring of Swarming Stabs that does 2D6 or more instead of 1D6? The table in the CRB just has me confused.

[Diego Rossi]

PRD wrote:

The easiest way to come up with a price is to compare the new item to an item that is already priced, using that price as a guide.

The table is the last thing to check, not the first. Then you can add that this ring do something unusual, making it even harder to evaluate.

The best way to evaluate it, for me, is following the cost progression of several other items: if you double the power you multiply the cost by 4, if you triple it you multiply by 9 and so on.

So 24.000 gp seem a reasonable price.

[Shadenir]

Thanks! Is that progression found somewhere or is it something you just noticed?

[Treefolk]

It's the same basic pattern of most magical stat items (belts of strength, rings of protection, etc).

[Shadenir]

Ok. What about if I wanted to increase the amount of uses per day as well?

[Diego Rossi]

Shadenir wrote:

Ok. What about if I wanted to increase the amount of uses per day as well?

That should be linear. The table say:

Charges per day Divide by (5 divided by charges per day)

The ring has 2 charges, so it should be 3.000 gp for each charge for a normal ring, 12.000 gp for each charge of a ring that do 2d6 of damage.

That progression break down when you reach 5 charges. In the table a constant item cost the same of a item with 5 daily uses but being a constant item would make a big difference for this ring.
The GM need to carefully evaluate the consequences of changing a item with daily uses into a item with a unlimited number of uses or a constant effect.
For some (let's say a item that allow you use the spell jump 5 times in a day) getting a unlimited number of uses has a limited impact. For others, like this ring, it can make a big difference.
As activating the ring is a swift action the effect of unlimited uses is less relevant, but making it constant would have a huge impact as it remove the action cost.

[Shadenir]

I wasn't thinking of making it unlimited uses per day, jut bumping it up to 6 or 8. The base Ring of Swarming Stabs is great at lower levels, but I'm trying to stat up a Level 20 version of my character and I'm pretty sure he'd try and upgrade by then.

Diego Rossi wrote:

The ring has 2 charges, so it should be 3.000 gp for each charge for a normal ring, 12.000 gp for each charge of a ring that do 2d6 of damage.

That progression break down when you reach 5 charges.

This part of that table confuses me. You're saying that if I want to increase the amount of charges per day, it's going to cost 12,000 gp per charge?

If I understand the math correctly, the lowest version of a Ring of Swarming Stabs would deal 1D6 extra 1/day for 3000 gp, correct? And if 3000 is the base price for one charge, then reversing that line (Divide by (5 divided by 1=5)) to find the base price and multiplying by 5 gives us 15000. But which effect on the table does that number come from? The spell required is Guidance, a 0-level spell, and the table says those are half the value of a 1st-level spell for determining price, but where is that applied? To the final number, after SL x CL x X? Or to the gold piece value represented by X? That's a big difference.

I thought I read somewhere one time about the cost of a magic item that replicates a class ability too, but I can't remember where for the life of me.