I haven't been in the tower, but there have been numerous hints that the
answer to your problem is found on the first level of the castle. Where is the
orb?
Jeff:
Did you map out the entire first level of Harkyn's Castle? There's something
on that level that you'll need to defeat the Golem once and for all. There's
a clue about what you'll need at 2N,3E on level three in the castle. Good
luck.
Nevin