
DM_Blake |

About 10gp.
Everything is worth what its buyer is willing to pay. As for that item, it's a novelty. A child's toy (with an awkward area of effect). A party trick. I doubt any buyer would pay more than 10gp for it. Maybe some rich old fool who wants to please his granddaughter might pay somewhat more.
Unfortunately, it certainly costs more than that to make such a thing, so nobody will ever make it, therefore it won't exist. Unless you find a rich old fool wizard who makes novelty baubles in his spare time because he's crazy as a loon.
Now, that presupposes that there isn't a real use for it. Like in a world where blue fire is a long-lost secret to revealing invisible creatures, or in a world where all divine prophets naturally turn fire blue around them so such an item would be a con-man's ticket to wealth and glory, then maybe such items might be priceless.
In that case, I might call it Prestidigitation but with a ridiculous range/area like that, there isn't such a spell. Minimum, I would suggest researching a new spell similar to Hallucinatory Terrain, affects fires only, but has a larger area. So 4 x7 x2,000 x2 = 112,000gp.
Small price to pay for always seeing your invisible enemies or conning the world into thinking you're the mouthpiece of a god...

CripDyke |
This is a bit like Hallucinatory Terrain-level change, but still significantly different.
Pyrotechnics is more like the effect you want, but nothing like the multi-fire sheer volume of changes you want.
HT = 4 * 7 * 2000...then *2 for slotless. 112k
Pyrotechnics is 2*3*2000...then *2 for slotless 24k
Of course, it doesn't blind or conceal. It doesn't put out fires. In many ways it's no more than a silent image, writ large.
Slotless silent image = 1*1*2000...then *2 for slotless, 4k.
Obviously the inflexibility is less useful than silent image, the range and multi-effect aspects are vastly more than silent image.
Here's what I would do:
Slotless, but non-portable (built into a tower or keep or something) = 9k
Slotless, portable with difficulty, by a team = 12k
Slotless, ioun-stone level portability = 15k or 18k, I'm a bit on the fence.
IF you can turn it on/off, double the above. Then it becomes a great signaling device, letting all the people in a wide area know about dangers or other news of community import. Cycled on/off can be coded to communicate different messages. Really, the utility here is vast for a clever community. Also, it permits you to turn it off when you know an enemy is coming so that they can't use their campfires to figure out their range to you.
Anyway, that's about what I would do.

Manwolf |

About 10gp.
Everything is worth what its buyer is willing to pay. As for that item, it's a novelty. A child's toy (with an awkward area of effect). A party trick. I doubt any buyer would pay more than 10gp for it. Maybe some rich old fool who wants to please his granddaughter might pay somewhat more.
Unfortunately, it certainly costs more than that to make such a thing, so nobody will ever make it, therefore it won't exist. Unless you find a rich old fool wizard who makes novelty baubles in his spare time because he's crazy as a loon.
Now, that presupposes that there isn't a real use for it. Like in a world where blue fire is a long-lost secret to revealing invisible creatures, or in a world where all divine prophets naturally turn fire blue around them so such an item would be a con-man's ticket to wealth and glory, then maybe such items might be priceless.
In that case, I might call it Prestidigitation but with a ridiculous range/area like that, there isn't such a spell. Minimum, I would suggest researching a new spell similar to Hallucinatory Terrain, affects fires only, but has a larger area. So 4 x7 x2,000 x2 = 112,000gp.
Small price to pay for always seeing your invisible enemies or conning the world into thinking you're the mouthpiece of a god...
It would take 332 castings of Prestidigitation to cover that area. It would take 123 caster levels to cover a mile radius with Hallucinatory Terrain, assuming those 30 foot cubes could be compressed down and spread out, otherwise it's 369 caster levels to do it, that's 53 separate castings by a 7th level mage, not to mention the travel with the range being 400 feet +40 feet/level. That's one hell of a powerful spell effect for a simple magic item, more likely a priceless artifact that has the downside that it sounds like it has no real value unless you like blue flames. There's not even a 9th level spell that covers that much area.
For something that falls so far outside the realms of the game mechanics, and sounds like it may be only used for flavor, I would suggest that it were a priceless artifact that is immense and far too heavy to moved, so no way the party can take it and get rich, because that is powerful to have such immense range. If it's a PC that wants one, either make them perform a quest for a diety, and the item only works as long as the PC worships the diety, speeds the diety's message and maintains alignment and whatever other strictures you impose, or just say no, a mile is just way too far and keep it within range of what an actual spell could do.

![]() |

How much would you say a slotless item would cost that changes the color of fire in a range of 1 mile to a blue color, no other side effects?
I'd price it around 900 gp to compare to Hat of Disguise and Hand of the Mage. This doesn't fit into the pricing chart, since this is pricing it based on the power of the item (or more properly lack of power.)