Marcone and the Castle

[Mira]

Lea moves her garden to wherever Harry sleeps. The Garden is probably a weakness if it stays because Harry can get there and there would be no escape into the Never Never for Marcone.

I thought the castle was able to draw the ley line in, not that it was there.

I imagine that's a Jim question, or maybe there is a WOJ on it, but I don't think you can draw ley lines to you or an area.  My opinion is they exist where they exist and powerful wizards and other supernatural folk make use of them if they can.  It is also possible I suppose that the exception is Merlin, if a wizard was able to draw a ley line in for his use it would be Merlin. However that doesn't quite work in the case of the castle does it?  By that I mean it's unlikely that the ley lines were transported over the ocean and to Chicago from England or where ever the castle originated.  So in my opinion the ley lines were already there, that may have made Harry's congering circle a bit more powerful or strong.  Though one has to ask, was Harry aware that they were there when he moved into the place years ago?  All I remember in Storm Front was him saying he liked his basement apartment because the basement had a basement for his lab.

[Bad Alias]

“You got those ley lines called up?” Merlin’s fortress, they had called it, this castle. And it had been built not only to shelter and protect, but to channel magical energy as well. Its layered enchantments gave it a metaphysical mass far beyond the weight of mere stone. Magically speaking, it was made of a superdense substance, like the material of a collapsed star. And like that material, it had its own kind of gravity. “It’s ready to bring them together,” Bob said.

As Bob began activating the castle’s enchantments, that gravity spread out, drawing toward it flowing rivers of natural magical energy in the earth—ley lines—drawing them toward it like a star being drawn into a black hole, like rivers caught in a massive earthquake suddenly forced to a new course.

I closed my fist, cutting off the energy, sent it back into the conjunction of the river of ley lines beneath me. The vast projection of my head went with it.

I'm fairly certain Harry would have noticed that his home was at a conjunction of ley lines. He'd seen Listen to Wind's map and Harry and Molly knew them from memory in Cold Days.

[Mira]

I'm fairly certain Harry would have noticed that his home was at a conjunction of ley lines. He'd seen Listen to Wind's map and Harry and Molly knew them from memory in Cold Day

Ley lines or Ways? Harry could very well have noticed, that's why he made his home at that address.  However I can't remember Harry making use of Ley lines until 12 Months.  I remember Rashid warning him about trying to make use of the power of the crossing Ley lines under Demonreach, trying to use them may have been what corrupted the Warden before Harry. 

[Bad Alias]

Ley lines. In Small Favor Luccio has a map of ley lines from Listens to Wind. In Cold Days, Harry starts marking conjunctions of ley lines, Molly finishes. The castle isn't mentioned.

Harry uses a ley line in Changes, but it wasn't a ley line of dark energy. It was the dark energy that would change Harry, not just energy. Harry considers using the ley line in Cold Days right before the Water Beetle shows up.

If you go back Turn Coat and see Harry's reaction to the ley lines in Edinburgh, it makes it hard to imagine he lived on one, let alone a conjunction of ley lines.

Bob says the castle "is ready to bring them together" and Harry narrates that the ley lines are drawn toward the castle like rivers suddenly forced to a new course.

The text isn't vague. The ley lines were not there before the battle in 12 Months. I'm fairly certain they aren't there after the battle either. They were relatively near. Near enough to be drawn to the castle. Maybe deep below the surface where they couldn't otherwise be accessed.

[Mira]

Bob says the castle "is ready to bring them together" and Harry narrates that the ley lines are drawn toward the castle like rivers suddenly forced to a new course.

The text isn't vague. The ley lines were not there before the battle in 12 Months. I'm fairly certain they aren't there after the battle either. They were relatively near. Near enough to be drawn to the castle. Maybe deep below the surface where they couldn't otherwise be accessed.
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Or Harry didn't know how to bring it to him yet when he lived in that basement.. In Twelve Months Harry talks about the energy, of the ley lines, in other words they were always there, but before the castle was there, Merlin's castle, the energy from them couldn't be called up.  Not easily, not under control, Bob even asks Harry if he was ready to channel that energy.