User blog comment:Solomus-BlackWing/Campaign Idea...sorta/@comment-3258762-20130515132023/@comment-1734134-20130515154130

I'd say the Ark Mechanicus is on par with a Battle Barge.

You know, with the Nova Cannon?

Also, to be percise, the Brethern do really on heavier ships when invading planets. Their fleet consists of the Ark Mechanicus, a Battle Barge, an Apoycalypse Class, and several others.