Tireless Blade is a trait in Destiny 2 that can appear on 37 weapons. There is also an enhanced version with a stronger effect.
What Tireless Blade does
Sword ammo granted for every other powered sword kill.
Enhanced version
Sword ammo granted for every other powered Sword final blow, with a chance for additional ammo to be provided.
Weapons that can roll Tireless Blade (37)
Black TalonVoid · Sword
The LamentSolar · Sword
Worldline ZeroArc · Sword
Abide the ReturnSolar · Sword
Abyssal EdgeStrand · Sword
Abyssal Edge (Adept)Strand · Sword
Aurora DawnStasis · Sword
BequestArc · Sword
CaretakerSolar · Sword
Complex SolutionVoid · Sword
Crown-SplitterVoid · Sword
Death's RazorVoid · Sword
Double-Edged AnswerVoid · Sword
Dragoncult SickleStrand · Sword
Eighty-SixStrand · Sword
Eternity's EdgeSolar · Sword
Geodetic HSmVoid · Sword
GoldtuskArc · Sword
Half-TruthsArc · Sword
Hardline CutArc · Sword
Honor's EdgeArc · Sword
Ill OmenStasis · Sword
Just in CaseSolar · Sword
NasreddinArc · Sword
Negative SpaceSolar · Sword
QuickfangVoid · Sword
Razor's EdgeVoid · Sword
Sola's ScarSolar · Sword
Sola's Scar (Adept)Solar · Sword
Steel Sybil Z-14Void · Sword
Stryker's Sure-HandVoid · Sword
Summum BonumArc · Sword
Summum Bonum (Adept)Arc · Sword
Temptation's HookArc · Sword
Thin PrecipiceStrand · Sword
Throne-CleaverSolar · Sword
ZephyrStasis · Sword