Guild Wars 2

What is its effect exactly? It says “Unblockable (5s) x2” – does it mean two of my attacks within the next 5 seconds will be unblockable?

I’m seeing a lot of battles where I’m pounding a blocking enemy and all I see is “Block” with no damage.

its 2 stacks of unblockeable. Meaning your next 2 attacks for 5 seconds are unblockable.