Clue
Because he felt that this was indeed not easy to find, Glen then searched further.
Starting from checking the grass around the lower wall of the watchtower, with his footsteps he tried to make sure if there was a different texture.
But after checking for a while, he didn't find anything suspicious or in other words everything looked fine.
On the other hand, when he found that there was nothing different about the grass below, Glenn then turned his attention to the tower wall.
Where the tower wall looks made of black rocks, with a fairly large size.
From observations made by Glen, it was found that the stone wall seemed to be made of river rocks that were arranged very neatly.
So that it makes the base of the tower sturdy.
But as before, no more abnormalities could be found.
Finding this fact, Glen felt very unhappy because he was tired enough to search for a while.