Destiny 2 The Final Shape
The reprised saint14 / Season of the Dawn weapons can be farmed an unlimited amount as long as you know the strategy in avoiding the weekly lockout. This is done by farming the midway chest in the enigma protocol mission. This will guarantee a double trait weapon and if you restart this checkpoint via the force reboot instance a double trait weapon will drop every time.
Note: Do not complete the second half of the mission! If you do you will be on weekly lockout of double trait weapons on that character until the next weekly reset.

The weapons which can be obtained from this farm includes:
Martyr's Retribution
Perfect Paradox
Line in the Sand
Breachlight
Patron of Lost Causes

DIM link: https://dim.gg/5vxqmni/Beta