A Nahel bond is the name of a form of magical connection made by humans on Roshar.
“Alakavish was a Surgebinder and yet the Nahel bond gave him no more wisdom than a regular man”
“The responsibility of what we've been given — whether it be the crown or the Nahel bond — needs to make us better”
The Nahel bond forms between a Spren and a Human. This bond allows them to draw in Stormlight and grants access to 2 Surges of power. The type of spren drawn to a human determines the type of Surgebinder they will become. Their are ten known types of Surgebinders. Each type of Surgebinders is believed to be tied to a different Spren, For example, bonding an honorspren would give you the powers of a Windrunner, while bonding a Cryptic would give you the powers of a Lightweaver. See Surgebinding and Knights Radiant for more information.
Notable Surgebinders
Kaladin - Windrunner/Honorspren - Syl Shallan - Lightweaver/Cryptic - Pattern Jasnah - Elsecallers/ Renarin - Truthwatchers/ Dalinar - Bondsmiths/ Lift - Edgedancers/