What are my options?

[muddoc]

IThere haven't been any proven "lethal" genes (That I'm aware of)...although on the fringes of the morph world, there are some mysteries that you're unlikely to need to worry about as you start....such as the super form of the "hidden gene woma" morph, called The Pearl. Some folks wonder if a "super spider" is lethal, but there is no proof of this.

Outside of the ones you mentioned, Sable to Spider will produce a cross that is leathal. I have heard rumors of a few others, but the above one is the only one I have been able to prove personally.