Cluster alliance

A cluster alliance is an alliance created with only members from the same cluster. It has several key features namely, defense, hostiles and intelligence.
Defense within the cluster is very importent due the ETA-1. This means that people can send you faster defense in case its needed.
Hostiles within the cluster is very painful. See the defense part and imagine the reverse condition happening. It is for that every importent to make sure no hostiles within the cluster will appear.
Intelligence from within the cluster and from the alliances put together make it for people possible to create the cluster alliance. In the beginning when the round starts people can see by the start who are actives and who are inactives. Those who start a cluster alliance will invite the active ones. Though due their activity its very likely they are skilled players in an alliance. Possible friendly but possibly hostile aswell. That is why its importent to get good feed-back from the alliance to know who is friendly, neutral or hostile.
First will the cluster alliance only make sure that no low eta hostiles from within the cluster appear so you can make a good start. But in later stage of the round the cluster alliance is a strong tool to destroy possible hostiles from your alliance or Block