Zariman Ten Zero
The ship that carried colonists for Tau, was lost in a Void accident and became a stopper between two realities.
COLONY SHIPFULL SPOILERS
The accident
As Void exposure turned the adults violent, the children survived together. The bargain with The Man in the Wall bound both the rescued Tenno path and its Eternalism outcomes.
The Chrysalith
Today it is the safe centre where the Holdfasts live. The Dormizone, Quinn's assignments and the daily life the community has rebuilt are all here.
Its work as a stopper
The ship sits in the rift between real space and the Void. If the Angels or other forces reach the Reliquary the leak could widen; defence has to be constant.