TL;DR
Remaking the control rod is one click. Walk to the device at the north end of the Eurac V laboratory, interact with it, and pick "remake the control rod." The objective advances on its own. That is the entire control rod step.
The real puzzle is the optional transmutation machine in the same room. It takes four ingredients and crafts a batch of permanent-use consumables. There are two valid recipes:
- Warp-immunity batch: Flesh Sample, Unidentified Acid, Adamantine Dust, Data-Crypt K-04-OH
- Toxin-immunity batch: Mutated Flesh Sample, Biogel, Crystal Dust, Data-Crypt H-41-OK
A wrong combination destroys the machine for the rest of the run. Make a manual save before you touch it.
Remake the control rod
This is the step almost everyone gets stuck on, and it is the easiest part of the room. People search "rogue trader control rod" expecting a sequence puzzle. There is no sequence. The control rod lives in the quest Secrets of the Navis Nobilite, the Navigator questline that ends with item:cassia joining your retinue. You reach the lab after clearing a couple of locked doors with Tech-Use and Logic checks.
Once inside, look to the north wall. The remake device sits there. Interact with it, choose "remake the control rod," and the machine handles the rest. No ingredients go in. No order matters. The quest objective ticks over and you can head back to continue the Navigator line. That is the whole thing.
If you came here only for the rod, you are done. Stay for the next section if you want the optional reward sitting in the same room, because it pays off the detour. The wider Eurac V puzzle walkthrough covers the doors and checks that gate this lab.
The transmutation puzzle
The actual puzzle is a second machine in the lab, separate from the remake device. It has four input slots, labeled for the kind of material each expects:
- Tissue Flask
- Catalyst Flask
- Reagent Flask
- Data-Crypt Connector
Feed it the right four materials and it produces a stack of six combat consumables. Feed it the wrong set and the machine breaks for good. No reward, no second try, and it stays dead for the rest of the playthrough. So before anything else: open the menu and make a manual save. This is the one room where a bad guess costs you a permanent reward, and a thirty-second save removes all the risk.
The lab hides notes pointing toward the recipes, scattered across rooms and corpses. You do not need them. We have both correct combinations below.
Grind your materials first
Two of the reagents are not items you carry, they are powders you make on site. A Transducer elsewhere in the room turns raw chunks into the dust the recipes call for. Run it before you craft:
- Psy-Crystal becomes Crystal Dust
- Adamantine becomes Adamantine Dust (some inventories spell it Adamantium Dust)
Process whichever dust your chosen recipe needs, then return to the four-slot machine with all four components ready.
Recipe A: warp defense
| Slot | Ingredient |
|---|---|
| Tissue Flask | Flesh Sample |
| Catalyst Flask | Unidentified Acid |
| Reagent Flask | Adamantine Dust |
| Data-Crypt Connector | Data-Crypt K-04-OH |
This yields a batch of six consumables that grant immunity to Warp damage for a single battle. The protection comes at a cost while it is active, so treat each charge as a tool for one specific fight rather than something to pop casually. Save them for the encounters where Warp damage is the thing that wipes your run.
Recipe B: toxin defense
| Slot | Ingredient |
|---|---|
| Tissue Flask | Mutated Flesh Sample |
| Catalyst Flask | Biogel |
| Reagent Flask | Crystal Dust |
| Data-Crypt Connector | Data-Crypt H-41-OK |
This yields a batch of six consumables that grant immunity to toxic damage for a single battle, again with a downside while the effect is up. Toxin-heavy encounters are exactly where this earns its slot.
A note on the slots: different players report the Catalyst and Data-Crypt sitting in slightly different positions, because the machine resolves on the set of four ingredients, not a strict slot order. Put the four components for your chosen recipe in and the craft completes. You cannot mis-order it as long as the four materials are the correct ones.
Which batch to make
You can only run the machine once per recipe set, and the materials are limited, so think about your party before you craft. The warp batch is the safer pick for most runs because Warp damage shows up in the back half of the story in fights that punish unprepared parties hard, and one battle of full immunity can flip a brutal encounter. The toxin batch is narrower in use but lifesaving against the specific enemies built around poison and corrosive attacks.
If you have the materials for both, make both. Six charges each is plenty for the fights that matter, and neither batch competes with the other for inventory pressure. The downside on each consumable only matters during the single battle you use it in, which is a fair price for hard immunity to a damage type that would otherwise shred you.
After the puzzle
With the rod remade and the consumables crafted, finish the rest of Secrets of the Navis Nobilite to bring Cassia Orsellio aboard as your Navigator. She is one of the strongest support companions in the game once built correctly, and the warp-immunity charges you just made pair well with the high-stakes encounters her kit is meant for. Slot her into the Cassia Navigator build to get the most out of her, and run the Cassia build guide for the full talent path. Bank the consumables for those fights and you have turned a confusing lab room into two permanent advantages.
Build: fb43eb90c0ab