“You're not supposed to be in here! You're going to ruin the surprise!”The following section contains spoilers.
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Currently, not much is known about Oro, only that it is a property intrinsic to all Tenno, although it is also stated by Teshin that there are enemies who possess the same power. It is only mentioned in Conclave's Annihilation mode, and its in-game purpose outside the game mode yet remains unknown.
It is heavily hinted that Oro is only possessed by those who have been exposed to the Void, as implied by the Tenno's origin: children who were lost in said white, extradimensional space where laws of physics hold little control.
Although it supposedly grants immortality to a degree, it is not all-powerful ability that grants them invincibility. There are a case where a Tenno is capable of death, as seen in Rell's death in Chains of Harrow. The exact requirements for a living being with Oro to die is still unknown.
- The creative director of the game, Steve Sinclair, describes the Oro as something "which represents the resurrection ability of Tenno and other enemies that Teshin is most concerned with".