Quote Originally Posted by Lyrinn View Post
I didn't know for the longest time that Esuna even had a secondary effect because it didn't have a buff or dotted line.

I'm not sure if it's entirely needed though, because most debuffs are "get rid of this ASAP or else" issues, so whether or not Esuna costs MP has no factor in your decision to use it.
You didn't know, although it's in the description?