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 ...

Corrupted Holokeys are one of the many kinds of resources players can farm for in Warframe. It has a somewhat niche use, but even so, it's a valuable resource for players who want to special Tenet ...