Treant

The most basic monster among the Plant-type ones, this creature is like pretty much all of the enemies you should have encountered to this point: relatively weak, and it shouldn't pose any problems to a well-prepared party. It's noteworthy because of being the first normal monster capable of using Stored Attacks, although the one it uses is merely an skill called Beat Down, which reduces the speed at which the Reyvateil can Purge. Other quality that makes it special is the fact that it's a pretty rare encounter, so make sure to try finding it if you want to complete your Bestiary.