Momentum Driver

After Sprinting for 1.5 seconds, Movement Speed is increased by 15% and Stagger Level reduced by 1.

Random drop on N'Erud.

Confirmed locations: The Putrid Domain, Vault of the Formless, Void Vessel Facility

Lore

The ring detects spikes in the wearer's vitals—increased heart rate from a kill, for example—and injects chemicals to steer that energy toward a specific purpose.

"House M'Ertal created a surprising number of inventions that rewarded killing. They assured us it was necessary, and in truth, once in our long history, it actually proved to be so.

Was it enough to justify millennia of lethal weapons innovation? They spent a great deal of effort assuring us it was."