>>724961670
>>724962246
>>724962436
>>724962574
The first thing you see when you fall down the shaft into the Underworks is a giant, vine-encrusted gate leading left, presumably into Shellwood. I can understand exploring Shellwood first, but if you didn't recall the giant door or didn't think to try the Grand Gate, which is visually the closest area to the Nyleth marker on the map, that's not the game's fault; that's on you.