Full canopic jar is a quest item from The Curse of Arrav. It is a canopic jar obtained from Senliten (from the previous quest Missing My Mummy) and filled with sacred oil, 3 dwellberries and a ring of life.
It is used to preserve Arrav's heart after it is retrieved from Zemouregal's base. It is then given to Ali the Wise and nothing is known what happens to it after that.