Unseen Crafter, from Races of Eberron pg 191
Unseen Crafter
Conjuration (Creation)
Level: Artificer 2, Bard 2, Cleric 2, Sorcerer/Wizard 2
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One invisible, mindless, shapeless servant
Duration: 1 day/level (D)
Saving Throw: None
Spell Resistance: No
This spell functions as unseen servant, except that the unseen crafter can be assigned any one task that can be accomplished by the use of the Craft skill. Appropriate tools and materials must be provided for the unseen crafter; it makes Craft checks using your ranks in the skill plus your bonus for the relevant spellcasting ability (Intelligence for artificers and wizards, Charisma for bards and sorcerers, and Wisdom for clerics).
An unseen crafter can take 10 or attempt to work more quickly (as described in the Craft skill description, page 70 of the Player’s Handbook), but this must be part of the command it is given when the spell is cast. Once the unseen crafter has completed the assigned task, the spell ends as if dismissed. If the unseen crafter leaves work undone, any creature or another unseen crafter can continue it.
Special: When the unseen crafter is commanded to repair a warforged, it receives a +10 bonus on its Craft check.
What I think Cage is doing with it is basically making the argument that you can:
1) Summon multiple crafters
2) Have them all aid another
To the effect of a group of mechanics is better than a single mechanic. Like... it takes a formula 1 pit crew seconds to change a tire...whereas one of them alone could probably still do it pretty quickly but it'd be like a minute.
i.e. 6 crafters doing an equal share of the work makes the work go 6 times quicker, and the craft check would have 1 + 5 aid anothers which is +10. If you do it with 11, then it's +20...and there's no limit really... If aid another isn't allowed to stack, it's just +2...
You can raise the craft DC to speed up the work, so the aid anothers stacking, speeds up the work.
Quick Creation
A character can voluntarily increase the DC of crafting an item by any multiple of 10. This allows the character to create an item more quickly (since he or she will be multiplying this higher DC by his or her skill check result to determine progress). The character must decide the increase to the DC before making the check.
So, then comes making the item... I think Cage is using the "command word" version, but the use-activated/continuous option is cheaper. Use-Activated covers command words anyway.
Base Price: (Spell Level x Caster Level x 2,000gp) Divided by 2. (spell has a duration greater than 24 hours.) So (2 x 3 x 2000) / 2 = 6,000. I am also making this into a ring, you put the ring on when you summon the crafters, then swap it out for a ring you'd wear the rest of the time...like protection / whatever. If you make it slotless, the price doubles.
6,000 base Price, so the XP cost is 6000/25 = 240xp. 6,000gp and 240xp. Market Price: 6,000gp
The Market Price = Base Price + Spell components and special materials.
Now we can lower these further... with the
Cost Reduction Handbook.Crafting it yourself instead of buying it. (DMG) 50% -
Already done thisItem is restricted to being used by those of a specific skill. (DMG) 90% -
Requires ranks in UMD for example, we'll use this.Item is restricted to being used by those of a specific class or alignment. (DMG) 70% -
Artificer Only, simple, add thisApprentice (Craftsman) feat (DMG II 177) 90% -
This is a good one, costs a feat though.Extraordinary Artisan feat (ECS53) 75% -
You should have this feat.Binding a Colossal Elemental (Preferably a whale with the Elemental Creature template) to it. (ECS+MoE+MotP191+srd) 80% -
This is good but you need to be higher level.Magical Artisan applied to an item creation feat, Bind Elemental or the Eberron cost reduction feats are best (PGF141)* 75% -
Should apply Magical Artisan to Extraordinary/Legendary ArtisanThe discount Kaorti get (Adds 13% of the gp value to xp cost, so this should be applied last) (FF 108 + web) 35% -
I never use this...I'm never a KaortiMembership in one of several guilds (see below) 90% -
I never use this...DM Fiat.Favored in Guild in an arcane guild (DMG II pg 227-8) 95% -
I never use this...DM Fiat.So if we use...
Self Craft (50%) / Skill Restriction (90%) / Class Restriction (70%) / Extraordinary Artisan (75%) / Magical Artisan (75%)
Now the way these stack is a little awkward but I like to do the math in decimal form.
0.5 x 0.9 x 0.7 x 0.75 x 0.75 = 0.1771875 (click the math to see the calculation)
We'll round up to 0.178, paying a little extra and RPing it as tips/bribes/excess and waste materials. But it works out as 17.8%
So
17.8% of 6000 = 1,068gp - That's what it costs you to craft. Rather than 6,000gp to buy.
Now... the XP portion.
Crafting it yourself compared to market price. (DMG) 4% -
This is the 1/25th thingFavored in Guild + several Wizard's Circles in Sharn (CoT) 90% -
I never use this...DM Fiat.Legendary Artisan (ECS) 75% -
Use this. It's awesomeMagical Artisan (PGF) 75% -
Already Using this. It's awesomeItem is restricted to being used by those of a specific skill. (DMG) 90% -
Already Using this. It's awesomeItem is restricted to being used by those of a specific class or alignment. (DMG) 70% -
Already Using this. It's awesomeThis Obelisk 80% -
I never use thisDemon Mastery and Extract Demonic Essence (10% chance of the item having a curse) (FC1) 50% -
I never use thisSpecific rooms in the Tower of Life. 90% -
I never use thisFocus Caster wiz/sorc ACF (Drag248 pg88) 90% -
I never use thisStudy the second chapter of the artifact the Nether Scrolls (LEoF) 75% -
I never use thisThere's a few campaign setting specific stuff you should tell your DM about and make it part of your quest / storyline to get them... I never use them unless I have found them in game and RPed it.
Self Craft (4%) / Skill Restriction (90%) / Class Restriction (70%) / Legendary Artisan (75%) / Magical Artisan (75%)
0.04 x 0.9 x 0.7 x 0.75 x 0.75 = 0.014175
We can make 0.014175 into 1.5% which I think is pretty fair, again, rounding up. You can do the math with the EXACT number if you want... I tend to round up for ease of math.
1.5% of 6000 = 90xp
Okay so Your at-will Ring of Unseen Crafters is 1,068gp and 90xp to craft.
This is subject to change, should you use different crafting modifiers obviously.... or if my math is wrong... which is very likely because I haven't really double checked any of this Math.
I use this for making my own items, as a calculator
https://docs.google.com/spreadsheet/ccc?key=0An6WwAiAZ-91dHR2dkJJaDBQeEVRUVlWM29MQ2l0ZVE#gid=0Sources for rules:
Creating Magic items on the SRD.Cost Reduction Handbook.