History of Black Fleet

Overview

The Black Fleet is the armada of tetrahedral Pyramid ships commanded by the Witness and its Disciples, the main military force of the Darkness. It has pursued the Traveler across the universe, destroying civilisations the Traveler aided, including humanity in the Collapse that ended the Golden Age. Its flagship is the Essence, led in turn by Disciples such as Rhulk, Nezarec and Calus.

Stasis

Destinypedia says Stasis came from Black Fleet technology deployed on Europa as a "gift". It also notes that the Exo Stranger is not allied with the fleet: she opposes the Witness.