Btw the Reaper Scythe, aka Mors' Scythe, cant reap souls on its own, the power of a reaper is needed.
Reapers are people like Death, Shi, Mors and Azrael.
Naturally there is also it's counterpart: The Angel's Scythe.
But guess what, reapers don't really server death, they kill and keep the souls for themselves.
Grim Reapers serve Death, and reap souls.
And Grim Reapers are stronger than Reapers and so many spells don't work. There is only ONE Reaper Scythe and ONE Angel's Scythe
If a Grim Reaper uses the scythe he will extract the soul with no problem