That's not the entrance. The entrance is further on the right in this dungeon. Hellhound appears in front of a new hole in the wall when you had all necessary events.
If got leneth preg had cg event hellhound maid sleeping chamber secret room wall open up hellhound be front of entrance let you in village at valcane dungeon.
I have completely completed all events with Hellhound and Lenet, but I can't open the entrance to the hellhound village.
