I'm just throwing suggestions out there, names and actual attributes are up to whoever decides if they should go in. The reason why I suggested "Eye for an Eye" do 2.5 times damage is that enemies health pools tend to be much larger than player's health pools, but I suppose it doesn't matter, taking the same amount of damage as they deal out is still damage that wouldn't be happening without the curse.
The idea that the witch would also take damage if they attack the one who is cursed is interesting, but that would not be great for melee-class characters who would otherwise use it. I don't think it needs such a downside.
