Is there a _s texture for that texture ?
Um i don't really think so, though i cannot be certain
Did you change anything in the client itself?
well kind of. When i did was i deleted a few patches from a moded game that i am working on and replaced them with original lichking patches. Though there were still custom patches from the game. I then changed the realmlist to localhost because i had wanted to tryout a new adt that i implemented on the game's custom map. So when i logged in, i first logged into a character which resided in my own personal adt which was in my own custom patch besides the game's patch and the lichkings patch. That is when this had happened. I might have done some other things but i cannot remember as if this point. Sorry if i wasn't clear enough on my explanation, if you want i can explain in more details next time.
It looks a bit like blizzard npc pathfinding rendering, but not exactly...
Not sure what that is but sounds cool!