After defeating the Untouched Inquisitor and acquiring the Dart Brand, proceed through the exit of the Dome of the Forgotten into The Ruined Temple. This area is a short but dangerous path leading to the next boss. It's filled with various undead enemies, including the Crypt Keeper and the Emberskull. Be wary of traps and crumbling platforms. The Dart Brand will be useful for crossing gaps and avoiding hazards. Your primary goal is to find the Sanctuary within the temple, which is usually located near the entrance or after a short traversal. From the Sanctuary, the path to the next boss, the Disemboweled Husk (if not already defeated as a side boss), or the next major area, the Ziggurat of Dust, will be relatively clear. Ensure you've spent your Salt and are fully healed before proceeding to the next major encounter.
