As a general rule, you should always have a counter attack skill on your action bar in PvE content.
Perhaps one of the most important parts of combat in Lost Ark, aside from staying alive and dealing good damage of course, is counter attacking!
To help you figure this out, our in-house video guru Dorrani has created a bite size guide on what the counter attack mechanic actually does as well as how to use it.
This ability, one which most classes have access to in one way or another, is crucial when taking on Guardian Raids and other PvE content.