I think this has been suggested before but I think this will be different.
Scythes will have a 2 hit swing were the scythe makes a wide arc both times. (also much faster but weaker than current "Heavy" weapons e.x. Divine Avenger, Graun Faust e.t.c)
All will have shadow/normal damage.
The charge attack will make a small blast (about the size of 1/2 a 3* blast bomb) and have a small chance of dealing curse(or whatever type you use) to you and to enemies.