User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6005381-20130203132053/@comment-969093-20130204191419

The appearance is like that of a regular Rath but with with some minor changes as explained by Pike.

Unknown has traits from multiple top-tier monsters. It is capable of performing attacks that Gurenzeburu, Doragyurosu, Gravios, Yian Garuga and Espinas have but with some minor original tweaks to them. Not to mention her own lethal signature moves. She can instantly take out a Hunter with just wind, something which you don't see anywhere else besides HC Gou Kushala Daora.

Ancestor doesn't sound ridiculous but the difference is so huge I have doubts they're even the same species. Modern Raths can hardly be called "evolved", a more fitting word would be "devolved" unless we take social interaction into consideration.

As for the shrade region, why? Unknown can be found on virtually any map imaginable. Jungles, Deserts, Swamps and even the Old Tower. The only place where you can't find her thus far is the Snowy Mountains but considering the fact she can survive at desert temperatures in the evening she should technically be capable of thriving there too.