Where mercy is but a hollow echo and pleas for forgiveness rot in the throat, there stands a weapon that moves the boundary between life and oblivion. Its sleek, black curve harvests not wheat, but the final shreds of mortal hope, bundling terrified souls into a quiet, endless night. Its gentle aura is a lie—a final lullaby to those who never see the blade’s edge coming. This is The Grim Harvest.
The Scythe is a custom weapon type from Steinhardt's Guide to the Eldritch Hunt, the info for it is below.

If you want to give it a mastery it would be Cleaving.
A breakdown:
Death Dealer: Advantage on attacks against creatures not at full HP.
End Bringer: Adds extra necrotic damage.
Soul Sower: Slice a foe to 0 HP, package their soul into a neat little seed, and later snack on it for hefty healing.
The Reaping: For 10 minutes, deal even more necrotic damage and obliterate any slain soul for good. It’s basically a “No Refunds” sign in weapon form.
Irrevocable End: Once used, you have to wait until next dawn to enjoy another round of grim reaping.
Take Care!
Evan | MonkeyDM