After exiting the Cavern of Earth with the Star Ruby in hand, you should head through the valley, and then go northwest. You will soon see another cave, one that is considerably smaller than the Cavern of Earth. Welcome to the Giants Cave!
Upon entering the Giant’s Cave, you’ll first notice the Giant. It seems that he has quite an appetite, but not for traditional food. Hand over the Star Ruby, then go and make a sandwich. You’ll have that much time as the Giant walks very slowly. After he disappears, follow the path to the south. There is some excellent treasure here.
Once you have collected the treasure, head to the northern part of the cave. The exit should be quite obvious. Back on the overworld, follow the path south. It winds a little, but there is no way to get lost. After a short distance you will see, you guessed it, another cave!
This is the home of the Sadda the Sage. The place looks doesn’t look very inviting, and there are empty bottles all over the place. Head through all the rooms until you find Sadda sitting at a table. After telling him of your journey, he will provide you with a crowbar, I mean rod. It seems that this tool is capable of removing the floor plate that prevented us from reaching Lich.