Design

Lin Yun clearly understood...

Not just the reason why the Monchi Family tried so hard, but also why Solan left for the Dark Azure Plane.

Because the Spatial Magic Tool he got from the High Mage in the Bone Plane had been made of Deep Sea Mithril, and Deep Sea Mithril was a material specific to the Dark Azure Plane. In other words, back in the days, that High Mage might have stayed in the Dark Azure Plane for some time.

He may have left some notes in the Dark Azure Plane...

Naturally, these notes shouldn't be very detailed, they would most likely mention the existence of a strange location, without more detailed explanation. That strange location should be the Planar Path, otherwise how could the 9th Rank High Mage already be making a move. That was a 9th Rank High Mage, currently besides Solomon, who could contend against him?

In fact, even that dead High Mage himself might not have known it was a Planar Path.