Opera:
See that tombstone over there? To get to Spezion, you need to go through the tombstone. I think you just need to go over there and look at the stone. I'm sure you can figure out how to use it to enter Spezion's consciousness.
Once you're in, put him back to sleep. It doesn't matter how you do it, defeat him, rock him to sleep, whack him on the head with a big rock, do whatever it takes!
"I'm on it."