Soloed it today as a 69 BST.
I was on my way back from Ifrits Cauldron, and was heading for the outpost to teleport home. All of a sudden I spot this gigantic tree, which I presume is an NM given its size, and sure enough it is Impossible to Gauge. So I whip out a jug pet and throw it into the fray. It died before Call Beast timer was rdy, so I had to charm Coeurls, Pugils, and Crawlers to throw at the tree until I could call another jug pet. These pets only lasted a few hits as they were "too weak", but did enough to take hate. I was about to engage with one of my jug pets when I see: Benediction! Woodland Sage recovers 4568hp. Ugh!!! So I just rinse and repeat what I was doing, engaged near the end and bingo. Overall, the fight was really easy, just very very long, and in the end all it dropped was an earth crystal. Oh well, still fun.