[Spoilers] Sanctum of the Chosen

Been trying to get through this place but there are untargetable rocks that shoot lightning that 3 shot my character at 80% lightning resist. Anyone have a clue how to deal with these, they move around and are right at the start and thus unavoidable.

Edit: seems retaliation damage will hit them.

Just ignore this things, when you enter in boss area this things disappear.