I just can't seem to gather the material I need in the lost grove. Is there some trick to getting more? I battle all enemies but after months, I've not came across one ancient entling and this is getting tiring. It would be nice to at least make a little progress.

I find it... maybe a bit hard to believe you haven't come across any ancient ents, considering they're always in the same two spots of the map and on a... 4? 6? hour respawn timer.

You just have to grind out the supplies and remember to do rounds of the grove when the elites respawn

I didn't realize the ents had a certain spawn point, I thought they randomly appeared like other monsters. I finally found them after using a map to discover the corner of the grove I kept missing.