I personally think that the Soul Cages and Siege Golems are fine. Yes they are deadly, but all of their deadly stuff has wind-up animation.
The Frost Bats(not sure how they are exactly called ingame) on the other hand do very deadly damage, they often come in great numbers and they don’t have any wind-up animation or telegraph indicator.
They should either have a wind-up animation and telegraph indicator or they should be very fragile and die in 1-2 hits.
Another solution could be to make the cone slightly bigger but do less damage, this way you really need to make a bigger effort dodging it, but it’s not as deadly.