The L-Cluster is a system of stars that can only be accessed via special L-Gates. It is the headline feature of the Distant Stars expansion.
The L-Cluster is only accessible through special L-Gates. These appear around black hole systems. When a player enters a system with an L-Gate for the first time, a new event is registered on the situation log. Once you have discovered it, you will need 7 L-gate insight to make it operative. L-gate insight can be purchased from curator enclaves, researched as a repeatable engineering technology, obtained from country events or from investigating anomalies