History of Ascendancy

Ascendancy is a Legendary Solar Rocket Launcher with a Precision Frame (auto-tracking missile).

Overview

Introduced in Season of the Lost. Destinypedia names Explosive Light with Adrenaline Junkie or Chain Reaction as the strongest roll. The Game Wiki's curated roll: Quick Launch, Impact Casing, Impulse Amplifier or Ambitious Assassin, Explosive Light or Chain Reaction. Flavor text is attributed to Petra Venj.

Acquisition

Both sources say it was earned by reaching reputation rank 16 with Commander Zavala, Lord Shaxx or The Drifter during Season of the Lost, and is available afterwards from the Monument to Lost Lights (Legacy Gear). Bungie's data also lists it as a drop in several activities including Quickplay and Typhon Imperator.

The two opened sources (Destinypedia and the Destiny Game Wiki) disagree on some details such as the season of introduction, and neither states whether the weapon can be crafted or has an Adept version, so those are treated as not stated. Bungie's in-game source text reads "Random Perks: This item cannot be reacquired from Collections."