Originally posted by dirktoot:

Im pretty sure you can parry literally all mobs with the carapace buckler.

It would seem there are a couple of 2* enemies capable of damage exceeding 300-400, but those encounters are rare indeed. It might be possible to parry them in right circumstances, such as being under effects of the Forsaken powers to reduce incoming damage, and having very high HP and block skill. But generally speaking, there are no unblockable directed attacks in the game. Some AoE stuff cannot be blocked.