Wow that is impressive that you got the Demon Scythe I've been trying for a long time and haven't gotten one! I think it is a 1/200 chance!
That's the one thing i've been afraid about because the program I use only allows 3 drops per enemy BUT I can add extra drops through a plugin but unfortunately the beast book doesn't register the extra drops I will see if I can fix this though thank you! :)