Do the mission (you are trapped in rasputin's bunker fighting a bunch of taken Knights and ascendant Knights, then a boss. Bring arc damage because the Knights have resistant shields).
You'll get a curious transceiver which requires 4 codes to be put into it. You can look those up cause I don't know them off the top of my head.
After this you get a mission to speed run the cayde's stash mission (you start at the broken bridge). You have 4 minutes to sprint to the top. Just avoid all the enemies. Once you get to the top, open the chest, kill the 3 wizards quickly, and you'll get an exotic fusion core.
There are three steps to repair the core, though I'm not sure if they have to be done in a specific order.
1. Do the archive mission on Venus on any difficulty.
2. Dismantle a legendary or exotic heavy weapon.
3. Do warsat public events on Mars, earth, and the moon.
After that you turn it into the gunsmith and that's all we know so far.
English
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Thanks.
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