Without access to Forged in Dragon's Fire-specific mechanics, my understanding is as follows:
-- Anything that has to be activated on-site gets rolled against the difficulty as though they were casting the rote like normal. Continuous Effects activate without a roll when they're worn by an Awakened user.
-- Thus, you can make convenient always-on effects (Matter 3 to make normal clothing as protective as heavy armor, Forces 2 to create a Ring of Invisibility, Correspondence 1 to create Portal-Detecting Goggles, etc.) in addition to Wands of Abyssal Flame-Casting (Forces 3 Prime 2), Aperture Science™-brand Portal Guns (Correspondence 4), or transforming Ferrari Automobile-Battle Armor with Integrated Solar Corona Plasma Cannons (Matter 4 to transform, Matter 4 for exotic Armor composition and Strength bonuses, Forces 3/Prime2 for plasma cannons).
To create your Artifacts, the lead designer (and anyone who wants to lend their expertise) must have sufficient Sphere ranks to be able to perform the desired effect(s) themselves. They must also have Prime 3 if they are working with Tass of appropriate Resonance, Prime 4 without (and making living/biological artifacts increases the Prime level required by 1.
you first calculate the level of the artifact by summing together the total number of Sphere dots for each level of Standard (ie. activated) effect in your Artifact, and double the dots for any Continuous effect (so the FABA-ISCPC mentioned above would be 4+(3+2)+4x2+4x2= 25). You have to get double that number of successes in an extended roll, and spend 1 Quintessence per level of that artifact. The FABA-ISCPC is obviously an outlier on extremely high-level crafting, and to power its plasma cannons you're also looking at building a Periapt to store Quintessence, but it has the bonus of being
technically usable by even a just-Awakened rube in duress. They'd have trouble using the plasma cannons at all predictably, but they could at least fight their way to safety and then theoretically transform the armor into the Ferrari to get away.
Your understanding seems correct, here, with the addition that if the effect is harmonious with the local paradigm (hinterlands for magic potions, shiny cities for supertech), it tends to be less vulgar also.
Talisman/Device
- Crafting process
----- Pay 1 temp willpower
----- Make the relevant item creation roll
---- Roll Arete vs the difficulty of performing the effect (8 for Prime 3 Vulgar) each hour and succeed
------- Each success gives 1 Arete
------- Incorporate the same number of tass (Or Quintessence if you are Prime 4)
------- You do this until you roll a regular failure, at which point the Talisman is done. A botch ruins the work.
-------- Pay 1 permanent Willpower
- Each use drains 1 quintessence Stores Quintessence to use on effects you perform with it.
- Has its own Arete which you may in place of your own when using this as a focus for effects in its paradigm
Functionally accurate with modifications formatted in.
How do you make an Artifact/Wonder? What I have been able to find:
-Prime 3 with the right Tass, Prime 4 with quintessence, Prime 5 with Quintessence to make a living artefact
-- No other steps!?
Can you make any of these with an effect you don't have sphere's in? I want to say no, but then there isn't much point in having these yourself.
You have to know all the effects you want to put into a Wonder before you can create it -- after all, you do have to successfully ritual-cast the effect yourself as part of the process of empowering the device. The benefits are being able to have a reliable focus on hand that you can pass off to others, or to have reliable access to a reliable, useful effect without having to cast and that doesn't count as sustaining an effect. The full creation rules are on page 54 of the StComp.
Storyteller's Companion also mentions an experience point cost of 2xp per level of the Wonder in question in addition to anything else, as a price for Background dots made after character creation; I don't know where to corroborate this off the cuff.
Artifact/Wonder:
The effect is powered by your own Arete.
Main use is to provide you with abilities you otherwise wouldn't have. Some are also always on, so you can ignore the +1 difficulty of having multiple procedures active
Doesn't Cost Quintessence unless the effect is activated and requires Quintessence as part of its normal costs
Will want to collaborate with your party to give each other access to effects outside your spheres, or which require multiple spheres.
-- If a friend has forces 4, you can use this to give everyone jetpacks
-- Or have the friend with Correspondence and the friend with forces work together to provide you all with lightning sniper rifles
There are some practical limits on Artifacts and their complexity, even if you don't bother with the experience cost I mentioned above. Each person who wants to make something needs to have Prime 3 and a lot of properly-Resonant Tass -- or Prime 4 and a lot of properly-Resonant Quintessence, at the very least -- and Tass and Quintessence are definitely uncommon resources at best. Also, each Artifact whose effect requires Quintessence has to be supplied like normal per use, or built with an integrated Periapt. Finally, the lightning sniper rifles you mention, with parts made by different people, would be separate Artifacts with separate activation rolls, which is double the chance for things to go screwy. Bad rolls happen very easily when you're rolling three-odd dice on an Arete check, and Paradox loves to haunt botches.
Charm/Gadget:
Easier to make, Limited Use
Again, not really super useful for yourself to have, but nice to hand off to friends.
Or if you're in a pinch and can't spare the juice to do something for yourself. Again, some days you really just don't want to chance a bad roll.
Talisman/Device:
Has its own Arete, which will generally be higher than yours. Basically a super Foci. Great if you can think of a semi-versatile one, or have a rote you use constantly.
Costs 1 Quintessence/use Stores Quintessence to use on effects you perform with it.
You are always connected to it and know if someone else is using it.
Functionality as corrected.