For the weapon forge in Destiny 2 you need Lost Prophecies. You fulfill this with Radiolarian cultures and Paradox amplifiers. How you can farm these items is explained here.
Since Curse of Osiris, you can visit the Lighthouse in Destiny 2. This is the new social space on Mercury, where Brother Vance, a secret and a weapon forge are located.
Through this weapon forge, you can obtain 11 exclusive Osiris weapons equipped with Vex technology. However, you must do quite a bit to unlock all the weapons.
How can I use the weapon forge and how do I get Lost Prophecies?
Before you can forge Osiris Vex weapons, you must first complete the entire story campaign of Curse of Osiris.
- After that, Brother Vance wants you to master three adventures in the Infinite Forest.
- If you succeed, you can tackle a heroic adventure. A heroic adventure significantly increases the difficulty and comes with certain modifiers, making it a considerable challenge for solo players.
- You can then return to Brother Vance, who rewards you with a legendary engram and a Lost Prophecy.
You will receive the “Lost Prophecy, Verse 1,” which leads you to the Osiris scout rifle. This prophecy can be inspected in your inventory. To fulfill it, you need a concentrated Radiolarian culture.
You can obtain this from Brother Vance. He will craft a concentrated Radiolarian culture for you if you bring him 10 Radiolarian cultures and 15 legendary shards.
Once this is done, you can use the concentrated Radiolarian culture in your inventory, which will fulfill the Lost Prophecy. Now you run to the weapon forge in the Lighthouse and craft the weapon: Afterwards, Brother Vance has more prophecies for you that you can pursue over time. They have various requirements that you must fulfill.
How can I quickly obtain Radiolarian cultures and Paradox amplifiers? – Materials for Prophecies
While the first prophecy only needs a concentrated Radiolarian culture, you will need three of them for other prophecies. This means you must bring 30 Radiolarian cultures to Brother Vance.
According to the item description, you obtain them through public events. About every second event drops a Radiolarian culture. So you need to complete around 60 public events to obtain just one weapon.
However: You can’t only obtain Radiolarian cultures through public events. Also, planetary chests and chests from high-ranking targets can contain this material. If you’re waiting for an event to start or have a quick moment during the event, you can loot these chests.
The Titan is said to be particularly suitable for this, as there are many chests near public events. Grab a ghost that shows you the nearby chests, and collect the Radiolarian cultures.
Note: With a very low chance, it may also happen that you directly drop concentrated Radiolarian cultures.
For the Paradox amplifiers, which you need for other Osiris Vex weapons, there is no “quick farming method.” You obtain them by completing strikes, crucible matches, and heroic adventures. PvP matches go the fastest. Regardless of whether you win or lose – after each match you receive one or two Paradox amplifiers. In rare cases, you may also receive an advanced Paradox amplifier, which Brother Vance will otherwise craft for you for 10 regular Paradox amplifiers.
How many Osiris Vex weapons do you already own?


