You have to go and talk to Bink and Bonk, then you go to Jorguss, complete the mushrooms for Jorguss mission 10 times and go back to Jorguss and then you are allowed to go past him!
Go to founders cemetery then go through Mausoleum and you will find Jorguss the giant spider.
Jorguss is hard 2 find but its easy: go to wailing tunnels and go further up, and up and up, and up, and up :) then right and he will come out of the dark :D easy
They are in the glowing lake in the wailing tunnels by where Jorguss the Giant Spyder lives. You need a fishing pole, though.
you need to talk to sir Liam he will give you a note pad to draw the tower for him and get him a mushroom and go back down and he will give it to you