With so many Onager fleets what builds are particularly good against it? What do people generally do/build knowing they will probably face a cataclysm throwing red dice into your deployment zone turn 1?

1 hour ago, Uncrustable said:

With so many Onager fleets what builds are particularly good against it? What do people generally do/build knowing they will probably face a cataclysm throwing red dice into your deployment zone turn 1?

Nothing eats an Onager quite like Admonition, especially if you can out deploy it. You've got the speed to dodge the arc, the shields / evades / defense kit to eat one good shot without going splat.

They also don't like squadrons, big dice attacks with accuracies (assuming they didn't bring Tua) and anything that makes their ignition shot feel like a waste.

Mass of targets also helps. The Onager does not like having to deal with high numbers of threatening targets. Also if you only have lower-value targets the Onager loses a lot of its effectiveness "Oh no you killed one of my 4 hammerheads with your giant space gun, whatever shall I do?"

Otherwise, just rush the thing. Larger ships can stack Eng commands and just barge into it headlong.