Twilight's Fall – a separate game. Twilight Imperium's expansions, mods and rules topics are not part of it.

The Imperial Vault

At the start of the agenda phase, if your monument is on the game board, gain any number of trade goods on this card. Otherwise, spend any number of resources to place 1 trade good from the supply on this card for every 3 resources spent.
The WinnuUnit – Structure – Monument

Monument

At the start of the agenda phase, if your monument is on the game board, gain any number of trade goods on this card. Otherwise, spend any number of resources to place 1 trade good from the supply on this card for every 3 resources spent.

Placement
Mecatol Rex

Source: Monuments