I cleared it yesterday on the second DF group. It was my second try in DF (and in life), one of the tank was new and there was another new in the party. After the tanks ajusted for the swap during the snakes phase and the party understanded the weather in phase 3, we got it. So, in my experience in DF for Primals ex, it's a easy one, maybe the easiest.

Next : Ravana! Seems pretty more hard...