Sturm

The Sturm Exotic weapon is a Hand Cannon that can be acquired through a quest chain started on Nessus.

Drang
Drang is a legendary sidearm that is acquired through the quest chain to get Sturm.

How To Acquire
Step 1. Complete the Nessus quests, "O Captain" and "My Captain". You will receive the legendary Sidearm Drang.

Step 2. Speak with Cyptarch Master Rahool to recieve "Relics of the Golden Age".

Step 3. Decrypt five Legendary Engrams, one Exotic Engram, and kill 10 Fallen on Nessus with Drang.

Step 4. Return to Master Rahool, then go to Tyra Karn on the Farm to get the second "Relics of the Golden Age".

Step 5. Kill multiple Fallen with Drang without reloading and kill 10 powerful (Yellow Health Bar) Fallen with Drang.

Step 6. Return to Tyra Karn to get the last "Relics of the Golden Age".

Step 7. Complete the quest "Exodus Crash" while making sure to kill the Servitor Kendricks-7.

Step 8. Return to Tyra Karn to recieve Sturm.

Item Lore
"Please! You don't understand. I'm supposed to be on that ship."

The guard smiled at Sigrun with a gentle condescension. "That's not possible, ma'am."

She understood why he would believe that; all of the colonists had entered cryo two weeks ago, but she could see the crew waving for pictures. They were awake! She could be awake, too. "I'm supposed to be on that ship," she insisted, leaning around the guard. There was still time. She could find whatever horrible cryo-coffin they'd loaded Victor into; she could kneel before it and beg him to forgive her. He wouldn't hear her but he wasn't gone yet-

"I need you to take a step back, ma'am."

"Captain Jacobson!" Sigrun darted past the guard. "I'm a colonist! You can't leave without me!"