To set things up:
Before you go back in the past (Silver Seed) have Claw Isle be overrun with Ratmen.
Now, back in the past, let's say that the cat creature (Yearl) in the Silver Seed is the ancestor (created by chaos scientists) of the Kilrathi. The Avatar frees him from his prison confinement in the Silver Seed in a place other than the maze (posibly the jail sell on Claw Isle).
Later, in present day Serpent Isle (after you have freed Yearl) we find his more developed offspring on Claw Isle. They are suffering from disease, and the beginnings of the "Devolment." Several catman corpses are in the surrounding huts. They would call themselves the Kilrat people (a nod to what they did to the Ratmen who are now confined to the dungeon areas of Serpent Isle)..... I have further ideas, but I wouldn't want to ruin any surprises. Does this sound like something worth working on?
Also, I've come across some "Realm of Claw" figures that would be suitable for progeny of Yearl. Below is a character portrait that I made in Photoshop. I can't seem to get Gimp to drag selections correctly, and convert to the proper color palette. This is said to be a current problem in their documentation. Of course, Photoshop seems to put transparent colors where they shouldn't be. So, yes, I am still having problems.
![Image](http://home.insightbb.com/~flicker/Zynda2.gif)