The key in the room with Kezzz opens a door the next level down.
When you get to the end of the well cave, save before approaching something you can see ahead.
There are a couple malachite veins off the path to the left which can be hard to find without triggering a cutscene. Also, if you are playing DKS (as opposed to the original release of D2:ED) the boss fight can be challenging if you want to finish off all the opponents, and a recent save will give you the option to reload and come back at a higher level if you need to.
Welcome to the forum.
