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He doesn't simply know about the tower, he IS the man of the tower. The most powerful magician. He's frozen up his emotions but he'll soon realize what his feelings are for athy. About the world tree, it has been a while but the sole purpose was to regain his mana. If there was any relation to athy, i think he's probably thinking it could help her more if he's more powerful (it's been a while since i last read but i don't remember anytjing else being mentioned). And that past athy, that other someone, he's guessed that a long time ago, and i remember lucas and athy having a conversation and there was a vague confirmation about it, i believe? I dunno, sometimes the translations aren't perfect.
I am so curious about him. I mean i think he knows what happened about the tower? that's written in the book. I mean he complaint about what's written on it right? and said it's just a fiction so i really think he knows about it. And I really like him for the princess lol. I am quite not sure if he really loves the princess, but he seems don't want to lose her and he's worried about the princess. I think he went to the world tree because for some reason, and it's connected to Athy. Regarding the past of Athy (i mean the inner Athanasia that got reincarnate in her body) he could feel that there's “someone” in her that's definitely in another dimention.