Hello,
 
Now we have some rattlesnakes around as well. You can try
and make a venom poison too. But thats not all. As broshanatia
is the worst poison in game it's availability has reduced a lot.
Now you can get grey fluid sacks only by killing and butchering
Shelob whos den is somewhere in swamp near the jungle.
Rattlesnakes however are more common now, you can find them
in jungle, near dwarven area, in graveyard and in some other
places.
 
Ging