Sunforging

Sunforging is the process of transforming a normal object into a sunucle. This process is done in devices known as sunforges, and those who specialize in it are known as sunsmiths.

Sunforging is understood as a process of bonding light to an object, and in doing so linking it to a living human being. This process increases that object's ability to do it's purpose to a supernatural degree, similar to how Lightbinders bond light to their physical attributes. This means that for example, sunforged blades can cut anything with ease, shields create invisible barriers, a cloak made to keep you dry expels water, and a cloak made to disguise you draws the eye away. Sunforged objects become near indestructible, but they shatter at the touch of darkstone and the Shade. Sunforged objects can be destroyed by sunforged items too, but with as much difficulty as if they were both normal items. If a sunforged item is destroyed the person bound to it will be greatly injured and likely die. Almost every time a person dies their sunucle shatters, but occasionally the bond will be passed to their eldest child.

Light can only be bonded to non-living things, and sunucles can only be linked to humans. In order to bond someone to a sunucle you by place a blood sample of the person within the object. Linking sunucles to people against their will is illegal, and as such a sunsmith usually demands that they extract a subjects blood themselves, this is a part of the sunsmith guild's regulation.

Sunstones are needed for the process of sunforging.

Sunforges
sunforges posses circular focusing lenses that are held above steel levers. some lenses are also made of darkstone.s

Sunforging process
An object meant to be sunforged must have a small compartment where the blood sample is to be deposited. Once the blood is deposited, the object is set in a sunforge, where the focusing lenses are set in a specific position, and a sunstone is set in front of them. The sunsmith then goes through a delicate and vague process in order to sunforge the item.

Reverse sunforging process
Reversing a sunforging is so delicate that few sunsmiths are willing to perform it, as failure means breaking the sunucle and possibly killing the one linked to it. The process of reversing a sunforge is done by carefully setting the sunucle in a 'lightless' state and diluting the blood that links it. The sunstone is set behind the lenses, this being the opposite position it is placed during regular sunforging. Light begins to drain from the sunucle, its transparency fading, and the object starts to look like black obsidian. This stage requires great precision, as if the luminosity is off by a fraction of a degree, the sunucle is destroyed. Once in the lightless state, the container of blood is opened, usually with tweezers, exposing the dried blood within. By dribbling a liquid substance over the blood, like saliva, and then breaking the dried blood with the tweezers, thoroughly mixing it together with the saliva, the link ends. The former sunucle remains intact in a delicate crystal-like state, where it can safely be destroyed.

Trivia

 * It is not specified if in reverse sunforging the blood needs to be diluted with something specific as saliva to break a link, or if it just needs to be diluted with any liquid. It also is not clear if the saliva of the one linked to a sunucle could dilute their own blood.
 * Daylen found a sunforge at the center of the floating isles, which he used to create Imperius, a sunucle that is immune the touch of the Shade and darkstone.
 * In Shad's video "BEWARE of the RULE OF COOL. How to do it right!", he talks about sunforging people as a way to increase their durability and strength at the cost of their sanity and lifespan. While not mentioned in the first book, it may appear in the future books and will be mentioned and the affects demonstrated in the film.