Kdintranet on Reddit provides a step by step on how to earn this weapon.
The Quest
The quest is called "Not Forged in Light" and you receive it from Lakshmi-2. AFAIK you get this after completing today
...
Action
100.00%
|
4
|
Adventure
75.00%
|
3
|
Horror
25.00%
|
1
|
Party
0%
|
0
|
Puzzle
25.00%
|
1
|
Role-playing
50.00%
|
2
|
Sandbox/Creative
0%
|
0
|
Simulation
50.00%
|
2
|
Strategy
25.00%
|
1
|
Sports
25.00%
|
1
|