‘We don’t know,’ said Hama. ‘But if the chance arises to destroy it, we should take it. The Coalition’s forces have learned that Ghost concentrations are hard to defeat, short of out-and-out genocide. They lack hierarchies, like human societies, which makes them impossible to decapitate. Usually assassinations are useless. It’s like stabbing a pool of mercury with a fork; it just fragments and runs away. But in this particular case you have this Seer, whatever it is, a source of power. So if we could get to that we could indeed inflict a great defeat in this war.’
-Xeelee: Endurance, "The Seer and the Silverman"