This is a short video to show you Robust Echeloch’s skills and how to counter them with Fiona. I am over-level here so obviously the fight goes much faster due to my increased damage, but the dodging/blocking mechanics don’t change.
I advise skilling up Heavy Stander A as soon as possible so that you can block heavy smashes without receiving any damage.
Note that I use Counterattack here a couple of times, where I hit the boss with the shield straight after I blocked. You may not be able to do that if you are still levelling up as you need level 20 to get that skill. It’s no matter though, if you don’t have Counterattack you just hit the boss with your weapon after blocking. Note the perfect guards also. Whenever I perform a perfect guard the spark when my shield gets hit is green. That means I am not consuming stamina. You can’t Perfect Guard a boss’ smash.