In order to unlock or use the Necramech, there are a few requirements that you must have met.
First you should play the main story until you have completed The Inner War .
This gives you the ability to transfer yourself out of your Warframe, which is necessary in order to be able to operate the Necramech and leave it again.
For this quest, further requirements must be met in order for you to be able to accept this quest.
Play the game and reach Mastery Rank 5, complete previous quests, and have completed the Bridge of Planet Sedna so you can continue.
You also need to have completed the Heart of Deimos quest in order to obtain the parts for the Necramech.
Obtained Necramech parts
To get the Necramech parts, you have to do a certain type of mission on Deimos in the open world.
These are called Isolation Vaults and involve you killing enemy Necramechs in the open world on Deimos, which can drop necessary parts for your own Necramech.
These missions additionally give you parts you need to increase your reputation for the faction, which you need to purchase the blueprints for the Necramech parts.
Alternatively, you can skip this entire process by purchasing a Necramech for Platinum from the shop.
You also have to assemble the weapon for your Necramech.
You can also buy the blueprint for it and the parts required for it from the Necramech parts dealer.
Summon and use Necramech
If you own your Necramech, you can equip it in the Arsenal tab of your Archwing or K-Drive and configure it with the appropriate weapon.
Also in the arsenal, you need to equip the Necramech in order to be able to summon it via your equipment bar.
Here select a free slot or one that you would like to replace.
In the next search you can filter by “Necramech” so you don’t have to scroll through the entire selection.
Once in the open world, you can summon your Necramech using the shortcut for Gear (default "Q").
Once you've done that, press the shortcut for Transference (default "5") to switch from your Warframe or Operator to your Necramech.
You can use the same shortcut to leave the Necramech or switch back to your Warframe.
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