Quondam

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Legends speak of creatures that are at once gangly and smooth, gray wraith-like shadows that appear once, and are never seen again. Those legends call these creatures the Quondam, the Former Ones. It is surmised that they are a very old race of some kind, older than the Collectors, or the Asari, perhaps predating the Protheans in some way. Not much else is known about them, except that they always have extremely advanced technology, do not attempt to communicate, and that they are very dangerous in battle.
The legends of the Quondam are told mostly in the Abyss, a few scattered tales have made it out into the Terminus, or the edges of Council space, but usually by the time a tale of the Quondam has traveled that far, the creatures in the tale have become something else. Collectors, usually. It is said to be bad luck to see a Quondam, that death follows the sight of one, and that they live out in the dangerous rim-sector called Lost.

Quondam

At the Heart of the Abyss Drascus