We have mega-structures and giga-structures but what about cluster-structures? it feels tiring to go into a cluster and conquer the entire cluster especially for there to be 1000+ galaxies.
now it wouldn't be necessary to "progress" but, it would be beneficial when your trying to get more DR points for the next dimension.
It should be expensive and the cost and production should vary by Galaxy, and Ferromagnetic Material, dark matter should increase production (i don't know how you would implement systems and planets tho)
The look for it should be just the giga-structure there's not much to say about it as a giant sphere or dome around it wouldn't make sense (Scientifically)
Cluster killers should be a thing but it should warn the player before doing it because u can do a galaxy and it would be fine but losing a cluster and u lose 1000 galaxy's+ (for those have stuff that's saved in there they don't want to destroy)