History of Sublimation

Sublimation is a Legendary Arc Scout Rifle (energy slot) from The Edge of Fate, a 150 RPM High-Impact Frame. TheGamer recommends it mainly for PvP with Moving Target and Explosive Payload; it also suits Arc builds.

Acquisition

Dropped by enemies and chests on Kepler (in-game source: "Exploring Kepler"), or targeted through Focused Decoding at the Altar of Relativity using Fated Ciphers and Phaseglass Refractions (Game Rant). Like all Kepler weapons it carries the "Exhaustive Research" origin trait, which loads micro-missiles when aiming at enemies. Sources do not mention a craftable pattern or Adept version.