In a couple of occasions have happened that after succeeding in the roll I didn't teleport to the place. Also the CD is very very random calculating it, and it goes from 32 to 54 or so. Considering the level when you can get the spell and the number of skillpoints that you can allocate in the skill... It is a little excessive to my taste. The rate of a successful walk is really low.
At least it seems to use Concentration skill now if it is higher than Search? There were reports in the past of that not being the case. Subject: Shadow Walk
Power is the most persuasive rhetoric. Friedrich von Schiller
So, Shadow walk use Search or -4 Concentration. I got that far. (It would be good to specify that point in the description of the spell in order to know well which skills it relys on.)
Then we know for sure it has a 33% Chance failure. (It is pretty high, why?)
Plus: the DC of the spell is calculated with a base of 19 +2d6 (What does this represent?); and another +2d3 (And this?); and +search skill (higher the skill harder the DC?)
And at the end the DC will be lowered by the feats named.
Am I right?
P.D.: No idea of scripting, apologize if I misunderstood anything.
This spell does seem to be overly complicated in its implementation
I may be wrong in this, but afaik shadow walk isn't primarily used for teleporting around the material plane, but rather to planeswalk to the shadow plane. Using it as a "normal" teleport is more like a side effect of the nature of the shadow plane being mirrorish of the material plane. The shadow plane is really dangerous and foreign and weird, and a mage would probably have a real good reason to want to travel through there.