Spoiler:
If you have killed Gaal, the beholder will appear immediately.
Otherwise, assuming you have picked up the part of the rod from the Rift Dungeon, then all you have to do is go into the underground Unseen Eye temple, to your left after you passed Gaal's room you should see a pit. "Walk/climb" down and you will be in the Ghoul town, which eventually leads to the lower reaches of the beholder dungeon (this is where you pick up the second part of the rift device).
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