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The '''Nahel bond''' is a magical connection between a [[Spren]] and a [[Roshar]]an human. This bond is a symbiotic relationship, granting the human participant the power of [[Surgebinding]] and the spren participant the ability to manifest into the [[Physical Realm]].
Originally, the Nahel bond granted power to individuals with no affiliation with one another. Eventually, the [[Knights Radiant]] arewere formed and the Surgebinders arewere gathered into ten different orders of Knights, each order's members bonded to the same type of spren.
== Formation of the Bond ==
The Nahel Bond grants the human the ability to [[Surgebind]]. Surgebinding allows one to use Stormlight, which grants superhuman abilities to the user, such as increased strength, agility, and healing abilities. It also perfects innate skills of the user but does not grant additional skills; for example, an expert spearman will become a spearman without equal, but will not become a master swordsman. In addition, Stormlight fuels the primary magic of Surgebinding: the usage of [[Surge]]s.
Each type of spren will grant its human Surgebinder two different Surges,. outWhich two is decided by what order of tenknights possiblethey are in. There are ten knowndifferent types of combinationssurges, and everyten Surgedifferent isorders usedof twiceknights, overlappingso once.each Insurge additionis toused theby Surges,exactly thetwo Bonddifferent createsorders of knights. There is a mentalcognitive connection tobetween theall memberspeople ofwho theare Bondbonded with a certain type of spren. This mental connection provides telepathy and recognition between the Bond members. Some Orders of the Knights Radiants have additional, unique abilities. For example, [[Lightweaver]]s are known for their mnemonic abilities (which manifests differently in each person) and [[Skybreaker]]s can divide the innocent from the guilty. This is a result of the two surges overlapping, producing an effect like mixed chemichals..
When the Nahel bond is at a sufficient strength, the bonded spren can instantly manifest itself as a Shardblade in any number of forms. For example, when [[Kaladin]] and [[Syl]] are in battle, Syl is able to manifest herself as a sword, a spear, and a shield. A human using a Shardblade without a Nahel Bond—inBond essence,(these ashardplates are dead spren—mustspren) must wait ten heartbeats before the summoning will take place, and are limited to using the Shardblade in the form of a large sword.
The Nahel Bond also grants the ability for spren to manifest themselves into the [[Physical Realm]] generally, outside of the form of a Shardblade. Additionally, the spren gains greater self-awareness, intelligence, and access to their memories the stronger their bond is with their human.
== Severing the Bond ==
The only known way to sever a Nahel Bond is for a Bonded Person to act in a manner contrary to the limitations of the Bond. This breakstemporarily "kils" the Sprenspren, insending somethem fashionback andto the [[cognitive realm]]. revivalRevival is possible, but difficult. It is even more sodifficult iffor the originalspren holderto bond with a different person after ofsevering the bond, isand nothey longerwill only do this if the person they originally bonded with is arounddead. It is uncertain if a Spren is able to sever the bond on their own and return to the cognitive realm.
== Notable Surgebinders and Spren ==
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