
To complete the Sanctum of Benediction in Crimson Desert, clear the Antumbra until the liberation meter reaches 0%, collect the cube and orb reactor cores from the lower side rooms, then use Axiom Force and Force Palm to install them in the central machine. The easy-to-miss step is the lantern beside each sealed door: light it before looking for another route.
The Sanctum sits in western Hernand, near the snowy edge of the map west of Hernand Town. It becomes available through Elowen’s Witch of Wisdom progression. If you reach the ruins and cannot properly begin the restoration objective, continue that questline first.
On PC, Axiom Force may be shown as L3 / TAB depending on your control setup. The exact prompt can differ by platform, but the sequence remains the same: grab the core with Axiom Force, set it near its destination, then lock it with Force Palm.
Enter from the south road into western Hernand and work through the ruins toward the central mechanism. Defeat every Antumbra group until the liberation meter displays 0%. Do this before moving either core. The puzzle rooms and stairways are compact, and having enemies attack while you carry a heavy environmental object is the fastest way to lose track of where you were going.
Once the site is liberated, stand at the central machine and use it as your reference point for the entire puzzle. Both pieces are accessed from the stairs and side rooms below it.
From the central machine, go down the nearby stairs. Turn around and check the side passage for a sealed door with a lantern beside it. Light the lantern to open the room.

Inside is the first reactor core, a cube-like piece often identified as a Fusion Reactor Core. Use Axiom Force to pick it up, then carry it back upstairs to the central device. If the core feels awkward to handle, keep it centered in front of you rather than scraping it along the doorframe.
Place the cube into its matching position on the central machine, above the northeast column, then use Force Palm to lock it in. The placement looks stricter than it is. You only need to line the cube up closely with the slot; Force Palm will accept it without a perfect visual snap.
If Force Palm does not secure the core, set it down again with the cube slightly more centered over the mounting point. Avoid trying to force it from the side. A clean downward placement gives the ability a much better angle to register the lock.
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Return down the stairs after installing the cube. The second core is behind another sealed doorway on the other side of the lower ruins. Look for the nearby lantern or brazier and light it; the door opens once the light trigger is active.

This is the main snag in the Sanctum of Benediction. The second room can seem absent if you search only around the central machine, because the environmental trigger is positioned by the doorway rather than beside the final pillar.
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The opened room contains the second core, an orb-shaped reactor piece. Pull it out with Axiom Force. Grab near the top of the orb if it catches on the doorway; pulling from the top keeps it from dragging sideways into the frame.
Check the room before leaving. It contains a chest with the Leather Helm of the Fallen Kingdom, so it is worth collecting before taking the orb back to the machine.
Carry the orb to the remaining broken pillar around the central device. Its direction can be described differently depending on how you approach the machine, but it is the unfinished pillar opposite the completed cube mount. Place the orb on its top surface and watch for the positioning cue: green, leaf-like effects appear when it is aligned correctly.

The orb may rest on the pillar before it is fully secured. Do not walk away after setting it down. It needs a final Force Palm interaction to count as installed.
Climb onto the orb once it is sitting on the broken pillar. From above, use Force Palm or Aerial Force Palm to drive it into place. The central machine activates immediately after the orb locks, cleansing the Sanctum of Benediction.
If the orb falls or refuses to lock, move it slightly farther toward the middle of the pillar top, climb back onto it, and use the downward version of Force Palm. The problem is usually its placement depth, not the timing of the ability.
The Sanctum is cleared as soon as both cores are locked into the machine. The route is short once you know that each sealed side room is opened by its own lantern, and that the final orb must be secured from above rather than merely placed on the pillar.