The 16 sanctums in Crimson Desert
The 16 sanctums that unlock the Lightbringer trophy, the most common of all the exploration trophies and the one you will probably get without looking for it.
And it counts towards Expert Explorer, required for the platinum.
What they are and how many there are
There are 16 challenges, all about restoring the forgotten sanctums scattered around Pywel by bringing the light back to them.
Completing all 16 unlocks their trophy, and they all count towards Expert Explorer as well, the gold that demands all nine exploration subcategories at 100%: 207 challenges in total.
When they are worth doing
It is the most common exploration trophy by a distance: 17.68% of players have it, almost as many as finish the story. The reason is that sanctums sit on the main routes and get cleared just by playing normally.
What we recommend
Our recommendation is that you do not plan this subcategory at all. It falls on its own while you do everything else. If you are missing any at the end of your playthrough, it will be one or two, not sixteen.
No challenge counts until you have its Sealed Abyss Artifact, and progress is not recorded retroactively. Collect all 141 before getting serious about this subcategory.
The trophies involved
Each one links to its section inside the full Crimson Desert trophy guide.