In Crimson Desert, Sanctums are ancient ruins found across Pywel that play an important role in exploration and progression. The witches you meet will send you to these locations to cleanse them of dark energy.
Each sanctum is a small, self-contained area with a puzzle or trial you need to complete. These puzzles can involve things like activating mechanisms, moving objects, matching symbols, or finding hidden paths. Some sanctums may also include enemies or environmental hazards.
When you complete the puzzle, the sanctum is cleansed, removing the corruption and restoring the area. This is often shown by visual changes like light returning or the environment becoming calmer.
Sanctums are worth completing because they usually give rewards, such as useful items, upgrades, or story-related progress. They can also unlock new paths or help you advance certain quests.