At the start of Maxos temple, what else is not whole around there? It may help to break any crates, etc and loot the place to help find what the clue is that the book is referring to.
You need to use a vase, like a lever, to open the locked door.
Once you finish Maxos temple, you will get access to sentinel island. Your first encounter there you can mindread to go up a level, so the higher level you are (I made it to level 18 in the fjords) the more of an experience bonus that will be. You don't need to get to a high level, but it would be better if you got to a new level before entering, to get a full level bonus.
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