Caltheris’s Sanctuary in Rex Infernus stays locked until several small rituals fire in the right order. The Nexus Forge has to be repaired with the Void Talon first. After that, a laser must enter her mouth, an offering has to burn in the Main Chamber, a floating dial has to cut open a wall, and a purple orb has to sit in her head when the rain starts.
Quick answer: Align the Pack-a-Punch cranks so a laser hits Caltheris’s mouth, finish the Shimmering Thread and dial lockdown, send a purple orb into her head from Caltheris’s Passage, then shoot her forehead with Astral Flame on the rainy round.
Items and upgrades you need first
None of the sanctuary locks open without the right tools already in hand. If a later interaction does nothing, one of these is usually missing.
| Item or condition | What it unlocks |
|---|---|
| Repaired Nexus Forge (Void Talon) | Lets the outer, middle, and inner cranks aim a laser at Caltheris |
| Void Claw | Pulls purple orbs for the Shimmering Thread, Astral Flame, and the final head shot |
| Pack-a-Punched Warden’s Blight | Charged shots launch the dial and send the orb into Caltheris’s head |
| Astral Flame | Lights the chamber brazier and later hits the forehead |
| Shimmering Thread | The offering that goes into the Main Chamber brazier |
| Titan Trap at Caltheris’s Passage | Kills the mist-infected zombie after the brazier is lit |
| Blue well in Veytharion’s Sanctuary | Starts the rain on the following round |
The Veytharion well has to be open from the earlier blocks puzzle. You can create Astral Flame at any point by pulling a purple orb into Pack-a-Punch and turning the wheels before the orb fades. Do not walk into a purple orb. Direct contact can break it into Salvage and force you to find another one.
Point the Pack-a-Punch cranks at Caltheris
The first lock is the laser path from the repaired forge. Three cranks sit on the pillars around Pack-a-Punch. A lever under the machine flips whether those cranks turn clockwise or counterclockwise. There is no fixed pull count. You turn them until the beam is aimed at this temple.
Light the Main Chamber brazier
The Shimmering Thread is a random drop, not a guaranteed pickup. Purple orbs float in the sky around the map. Pull one to the ground with the Void Claw, then interact with it. Most orbs give nothing useful. Keep pulling until the thread appears, then take it inside.
Caltheris speaks a quote if the kill counted. No quote means the wrong zombie died, the trap was not used, or the brazier was never lit with Astral Flame.
Stone tablet dial and Shadow Soul lockdown
The laser puzzle lives on the Main Chamber floor, not on the forge cranks. Face east toward the brazier and look for a stone tablet on the ground. The tablet only reveals its dial after you stand on it and keep aiming long enough.
The wall must break, the four souls must die, and the statue must be destroyed. If the laser sits even slightly off the northeast mark, the wall stays closed and the lockdown never starts.
Purple orb, rain, and the forehead shot
The last lock is a two-part trigger. Caltheris’s head has to glow purple first. Rain has to be falling on the next round after you use Veytharion’s well. Only then does Astral Flame on the forehead finish the sanctuary.
Why the cleanse does not trigger
Each failed lock has a specific miss. Lightning is the only signal that the temple is done. If that strike never comes, match what you see to the gap below.
| What fails | Exact miss |
|---|---|
| No laser in Caltheris’s mouth | Outer, middle, and inner cranks are not aligned, or the floor lever is turning them the wrong way |
| No Caltheris quote | The Shimmering Thread was not placed, the brazier was not lit with Astral Flame, or the mist zombie was not killed with the Titan Trap |
| No dial appears | You left the tablet or stopped ADS before the reveal finished |
| Wall never breaks | The beam is not sitting just right of the blue crystal, or zombies are not dying under the dial |
| Lockdown does not end | One Shadow Soul is still alive, or the statue was not destroyed after the souls died |
| Head does not glow purple | The orb was not launched from the Passage stairs with a charged Warden’s Blight shot |
| Forehead shot does nothing | Rain has not started yet, or you do not have Astral Flame |
When lightning hits, Caltheris’s Temple is cleansed and that sanctuary lock is finished. If the forehead shot lands in clear weather, wait for the rainy round and fire again.
