Noland Lee used "Mental Beacon" and "Mental Vision" to remotely observe the wizards' base.
It was a magical creation floating on the sea surface, with a metal disk base more than 200 meters wide, a translucent magical dome, and a small magic fortress.
When Noland Lee watched it, he happened to see the deep-sea wizard on duty finishing his patrol task and flying into the magical dome.
Casting deconstruction on the figures descending onto the metal base, Noland Lee found the plan related to his assassination from the memories of others.
Deconstruction results showed that Noland Lee was over-worried.
The wizard hidden in the base was not Fagen's family secret guard. He was a geo-wizard related to Fagen by blood and had the strength of a Sixth Ring combat wizard.
Aside from this person, Fagen had bought off all seven deep-sea wizards in the base. They would jointly provide false testimony for the incident of the Dread Sail Pirate Nation attacking Noland Lee.