“You're not supposed to be in here! You're going to ruin the surprise!”This article contains spoilers about the game's lore.
Due to the circumstances through which the Kuva Fortress itself appears, accessing Kuva siphon and Kuva flood missions is only possible after completing The War Within quest. Kuva siphon and Kuva flood missions can be found on nodes marked with a Kuva symbol. Each mission only appears for a certain amount of time before the Kuva Fortress moves again.
Acquiring Kuva Edit
The only manner of acquisition is through Kuva Siphon missions that there are two types of - the regular Kuva siphon (mission level 25-35) and the Kuva flood (mission level 80-100). As the name implies, the Kuva flood will offer more Kuva as a reward, however, in order to obtain it, you will need to face drastically stronger enemies.
Successfully destroying one Kuva Siphon will grant around 550-700 Kuva, while in case of the Kuva Flood, the reward is doubled.
In addition to its use as a crafting material, Kuva is used to randomize Riven Mods.
Blueprints Requiring KuvaEdit
The involvement of Kuva is largely revolved in The War Within quest, wherein the elder queen of the Grineer holds a Kuva Scepter, symbol of Orokin dominion used to command their Dax soldiers, which Teshin was a part of. Kuva is also used to perform Continuity, the Orokin ritual of transferring the consciousness of a dying Orokin to a new body.
The exact nature of Kuva is a mystery yet to be revealed. Though, it is mentioned by Teshin that the Kuva Guardian's weapon, Kesheg, is imbued with Kuva which supposedly makes them immune to Warframe powers. This is alluded in the braids of the queen throne, wherein they are immune to all Warframe attacks but the Operator's Void Laser, suggesting they were also made with Kuva.
Another possible property of the Kuva can be seen within Orvius, the weapon used to disrupt the player's Transference, which was made with the same Kuva substance, as well as within the Kuva Scepter used by the elder queen, used to knock the Operator out of their Warframe, preventing further Transference. This suggests that Kuva, in essence, has the ability to interfere or limit the Transference to a certain extent.
In Cephalon Ordis' fragments, it is revealed that one of the Orokin executor, Ballas, offered Ordan Karris a red vial, calling it an opportunity "to be one of us". This was later presumed to be a Kuva vial, wherein it was possibly used on the Beast of Bones, as an eternal punishment to be a Cephalon slave, rather than a status ascension.