I am currently doing a test to see if I can make a skill crystal for Shadow Cry that will work in game, if so it will be released in several weeks and I will may a copy to people who own Atropus.
If it doesn't work, I will probably cry into my pillows for a few days until I come up with another solution.
EDIT: Test one has failed, but am doing something to see if it is fixed. If it still doesn't work, than as I thought the skill was made specifically for Eseriel, and I will have to either clone the skill, or look at doing something else.
EDIT2: I got this working on a cloned skill... However this would have allowed people to double stack Shadow Cry, so we aren't going to be doing that. The base Shadow Cry is not loading at all in game now, so I will play around some more to see if I can get it working.