Loot the body holding a Rune Arc and open the gate to the left. Once down in the well, you may want to activate a Lantern if you have one to help with visibility. Head down into the well using the ladder. Among the rubble you should be able to spot a lone well in the shadow of the large dragon wing, guarded by the fast-crawling enemies seen in the Volcano Manor.

Once they've been dealt with, look over the balcony to the left off in the northwest side of the ruined city streets.

Go down the stairs to the lower northern ruined part of the city and stick to the left side as you advance to take out the three Leyndell Knights. To reach the sewers beneath Leyndell earlier, head to the Avenue Balcony Site of Grace in the middle of the capital just off the main road that runs through it.

If you decide to come back to this area after getting to the Giant's Forge, you'll find that a large gold sewer grate along the capital city's main avenue has been removed, allowing you to drop directly into the underground area.

Download subterranean shunning grounds