In one part, the gravity is turned on and Swansong hovers above the floor. Phase 1: This phase consists of the two alternating parts.
The boss fight with the Swansong can be divided into two phases with an intermediate part. It can be found at the end of the Cultist Mission. The Swansong is the final bounty of the bounty hunting questline, it's a mech suit piloted by Asra Nox.