[Perdition]

https://gyazo.com/4033c3b2a3558b5d1b5947d2176de453

In the screenshot, I use both Water Dragon and Water Pillar against the same enemy. It's proccing weak because I have both maxed Crest LV and an idol equipped. Water Dragon has 120% ele atk scaling, and Water Pillar has 130%, yet Water Pillar does MASSIVELY lower damage in comparison. 

https://gyazo.com/be686eaba56dc0e570ca15f060cd9c3f

These are the monster's stats for reference. What immediately came to mind was Water Pillar targeting defense rather than res for some reason since the Critter's res is quite low, but it's defense is high. Either way, this damage isn't right.

[DonoftheDerps]

I did a little testing on prinny cause I thought maybe it would be something about servant of a darkness authority. But everything came out okay. Not sure what you did but its something specifically that you did.

Both water pillar uses, adding up to pretty much the same damage.
https://gyazo.com/f05ed7b1a69c1ee97d7786c7523a6881
https://gyazo.com/a2be2c81ca80c75c29d78e2b78b7da6b

and both water dragon uses coming out the same, doing the same amount of damage
https://gyazo.com/01a697a10ca0f4cbf26879ce9b855bd9

my guess is magic armor on that monster screwed you cause it affected BOTH instances of damage since servant of a dark authority makes it 50% water and 50% dark damage. or maybe it is hitting armor instead. Either way its specifically something to do with that since it works fine vs prinny

[Neus]

This one will need some more thorough testing I think. The damage has the protection ignoring flag, so it should be ignoring armor on the two hits.