Sacred Soil is on a 30s cd so you can use it twice per Aetherflow. For end game raiding in Binding Coil, you would want to mitigate as much damage as possible as we are undergeared. Keeping it on cd or saving it for big hits would really depend on the fight, and how much damage is being taken by the tanks or raid, i.e. situational.

For example: On Turn 1 BC, you would save Sacred Soil for when the stacks on the boss increase (due to fools messing up with slimes or w/e) and the tanks get hit more. However, on Turn 2 ADS, you would be better off chaining Sacred Soil since there is always a tank taking huge damage because of the vulnerability stacks.



And yes, it consumes one Aetherflow charge like Energy Drain.