Knight's Vow

Stats

Values as the League of Legends Wiki's item data lists them, for every mode; the data doesn't state their units.

Effects

• Pledge (unique): Designate the target allied champion as being Worthy, forming a tether between you and them. Champions can only be designated as Worthy by one Knight's Vow at a time. You cannot be designated as Worthy by an ally's Knight's Vow once you've formed a tether.
• Sacrifice (unique): While your Worthy ally is tethered to you and you are above 30% of your maximum health, redirect 14% of the pre-mitigation physical and magic damage they take to you as the respective damage type. Additionally, you heal for 12% of the post-mitigation damage dealt by your Worthy ally to champions.³

Arena changes

• Ability haste changed to 15.
• Armor changed to 50.
• Base health regeneration changed to 0%.
• Health changed to 400.
• Sacrifice's heal is special-cased to never trigger Puppeteer Pull Their String's cooldown reduction.⁴

• On Singed, a support mana build with Sanguine or Mind to Matter can include Seraph's Embrace, Diadem of Songs, Knight's Vow, Liandry's and support augments to help keep an ally alive.⁵
• Knight's Vow can help keep an ally alive when that ally is dealing most of the team's damage.⁶
• Knight's Vow is really bad on Mordekaiser.⁷

• Pull Their Strings' cooldown reduction never triggers from the heal granted by Knight's Vow's Sacrifice.⁴⁸

• Knight's Vow can randomly unbind between deaths or rounds.⁹

Earlier formats

• Since patch 25.16, Knight's Vow no longer loses the link on some rounds.¹⁰ 8x2 duos
• Since patch 25.07, Puppeteer no longer gets cooldown reduced by Knight's Vow.¹¹ 8x2 duos
• Knight's Vow's bug fix for the Worthy link being removed on certain rounds was reverted and delayed to a later patch because it created further issues.¹² 8x2 duos
• Knight's Vow was part of a Yone build with Moonstone, Rite of Ruin, Sword of Blossoming Dawn, boots, and either Reaper's Toll or Force of Entropy.¹³ 8x2 duos
• Knight's Vow was part of a support Nunu build with Moonstone and Spirit Visage.¹⁴ 8x2 duos
• Knight's Vow fit a build for a champion whose shield only scales with health, depending on the game.¹⁵ 8x2 duos
• Knight's Vow needed to be applied to its partner at the start of every round.¹⁶ 8x2 duos
• Knight's Vow needed bug fixes.¹⁷¹⁸ 8x2 duos
• Knight's Vow is recommended alongside Spirit Link and Spirit Visage for supports paired with a hyper carry.¹⁹ 8x2 duos
• Knight's Vow is suggested for Rell alongside Moonstone and Spirit Link.²⁰ 8x2 duos