Shadow Grandel: Nothing particularly special- simply the typical C3 grendel with supernatural shadowy colouring.
As genetic breed? WooHoo, sounds good!
As breed with own sprites? Wasting of breed slots. There are already too many grendel breeds which are just recolored C3 ones and I think it is simply boring and wasteful. CL made more then 100 breed slots and then such...
How are you going to change the norn's "element"? Different sprites or loads of genetic reactions or both? Sounds interesting.