Unnamed Sentient Mother

"All is silent and calm. Hushed and empty is the womb of the sky."

- Unnamed Sentient Mother

The Unnamed Sentient Mother makes its first appearance - albeit through a recording - in the Stolen Dreams and The New Strange questline, and makes its first proper appearance in the teaser trailer for The New War.

Stolen Dreams
The Unnamed Sentient makes its first, recorded appearance in an Arcane Machine located in a Derelict, linked to an Orokin portal located in a Grineer Settlement on Alator, Mars. After the Tenno uploaded their collected arcane codices into the machine, it instead broadcasted an audio transmission with the following cryptic message:


 * All-All is silent- Hushed-hushed and empty is-is-is the womb of the sky.
 * All is silent and calm. Hushed and empty is the womb of the sky.

The Tenno would then be attacked by an Arcane Boiler accompanied with several Infested units which they fought off, and retreated the vicinity as soon as the Lotus calls the search off.

The New Strange
The Unnamed Sentient makes another recorded appearance in the data vault located near the Prison Complex in Nuovo, Ceres. The Tenno infiltrated the vault, and then extracted the security logs in the form of "fragments of a biological signature". The fragments were then scanned by Ordis in the Orbiter, and then plays the security log which featured the sound of the Grineer engaging in a battle, along with yet another cryptic log stating:


 * Here we shall search and find. The eyes of day drinking the night.

Later on, Cephalon Simaris decided to help uncover the mysterious message after the Tenno helped him with a few Synthesis. It turned out that the biological signature was Tenno in nature, and - even more curious than before - Simaris then sent the Tenno a blueprint for a Scorched Beacon.

After the Beacon was built, Ordis noted that it seemed to be sending out a signal, which seemed to be directed towards the Arcane Machine they have encountered before. Ordis began to malfunction due to the incoming transmission from the same machine and was intervened by Simaris to save his systems, but the unknown transmission played the following familiar message:


 * All is silent and calm. Hushed and empty is the womb of the sky.

The Tenno then tracked down the source of transmission, extracting information about the signal from another data vault in Morax, Europa, to reveal that a is in the transmission, and that someone is covering their tracks using it. Simaris deduces later that the Chroma in question was not Tenno-controlled, and instructs the Tenno to defeat the Warframe in order to find out the one who was controlling it. However, Ordis, worried about the Tenno Operator instead told them to ignore Simaris' advice and synthesized the Warframe instead, making it impossible to deduce the source of the controller.

The New War
The Unnamed Sentient finally makes its proper appearance in the teaser trailer of the quest itself, revealing it to be a gargantuan Sentient Mother, mother to Natah herself. Commanding a massive army of Sentient drones, the Sentient Mother commanded Natah to take her "fire" back from the Tenno.

As the Sentient Mother shared the same voice as heard in the Arcane Machine in the Stolen Dream quest, as well as the security logs extracted in The New Strange quest, it can be assumed that these audio logs and the remote-controlled Chroma are done by the Sentient Mother herself.