History of Relentless Strikes

Relentless Strikes is a trait on swords. Landing three light attack hits within a short time grants Sword ammo. Swords that roll with it include Unspoken Promise, It Stared Back, and Double-Edged Answer.

Wolfsbane catalyst

The Wolfsbane catalyst is a Relentless Strikes Refit. Every third attack with Wolfsbane grants bonus Sword ammo, and each hit must land on at least one enemy. The catalyst is completed in the Heliostat Exotic mission: insert a Datapad into a console in the mission, then finish the mission.