There’s currently a bug in Soulfire Bastion where the Possessed Construct’s targeting reticule does not appear until after the firing animation has completed. And the reticule will always appear right under you, no matter where you are, and the damage will be dealt after like 0.5-1 second.
The most obvious counter to this is to either kill it before its firing animation completes, or switch to necrotic shield until it’s dead. However just like its fiery counterpart, the Siege Golem, they have the ability to shoot from off screen, often times 1.5-2 screens away. While the off screen part in and of itself is annoying, and something I wish EHG would look into eventually, Siege Golems’ targeting reticule appears under you before they fire, leaving you ample time to move out. You can’t do that with the Possessed Constructs as you have no idea you’re being targeted until it’s too late. I just died while reading the modifiers of the next level, completely unaware a Construct was nearby.
I’m hoping that this is already on your radar, and a fix is coming soon. If not then please look into it.