Murky Morph Potion
Murky Morph Potion is part of the Halloween 2009 Quest Chain. It can be obtained by double clicking the cauldron in Jared's Lab after reading the journal on the East table.
The Murky Morph Potion is a Blessed item, weighing one stone, with a 6000 second timer. It cannot be removed from your backpack, so it may not be retained.