Journey

Playing as Konstantin, I reached the mausoleum. I completed all quests except for the ones involving bears, the thief, the Ashi's tear, and the astral gate (5th building). I hit a dead end; I haven't encountered Law yet, and I have no idea where to steal the artifacts. I've explored all available parts of the dungeon, and I can't pass any of the castles except for the one with the sword and yellow tent. On the surface, I've cleared everything. How do I access the part of the dungeon located near the starting castle? Where should I go, and what should I do?