For those who like their hive tyrants, this formation is for you.
There's nothing quite as powerful as that of the mind of a Hive Tyrant...except, of course, when several tyrants link their minds together to form an even more powerful network of psychic energy. While this is not common, hive tyrants from different splinter fleets have been known to work together in this fashion, especially when facing against powerfully psychic enemies. And on the very rare occasions that they do, they are indeed very formidable as they augment each others abilities.
The Indomitable Hive Mind Formation