Yeah. I've been experimenting in whispers - Turns out the Culverins will detonate a few seconds after you destroy both their arms. This deals significant damage in an AOE. The stone blocks with legs or arms? The stone block the arms and legs are attached to is their weak point. There are security terminals that the Culverins will use the summon enemy Voidrigs to fight you. You can find Apple computers scattered aroudn for summoning your own voidrig. There's really a lot going on in the whispers in the walls levels.