Regol handed Link the map and pointed to the secret entrance in the Castle Gardens so Link knew what path to take on the map. Regol pulled off his ring and it gave way to his black doctor robes, plague mask, and tricorn hat. Regol did wonder if there was any traps to be had in this ancient labyrinth of secret passage ways. He made a duplicate of himself from the shadows of the dark tunnel and ordered it to run down the tunnel. The duplicate made it a ways, almost out of sight from the groups eyes when it suddenly stepped on a pressure plate and spikes stabbed it from both side walls, the duplicate turned into a cloud of black mist. Regol stepped behind Caelan and gave him a pat on the back. The man was a treasure hunter and a veteran of diving into old abandoned ruins, booby traps and all those things were right up his alley.

I mean the path to the Castle Garden was a short trip on the map, how many traps could there be between where they were at and their destination? All they had to do was make it to the castle and he would be able to get them to the Princess, out of the Castle would be a different story.