One of Warframe's tougher resources to farm are Eidolon Shards. These are tied to endgame bosses that roam the Plains of Eidolon on Earth. You'll need to progress through the story until you complete ...

To get Corrupted Holokeys, you will need to complete Void Storm missions in Railjack or defeat Sisters of Parvos. Void Storms play out just like normal Void Fissures but will take place in Railjack ...