Chain hit gem actually seems to be the problem, I think it's very bugged in traps. It will greatly increase the mana you get in a trap with poolbound+mana steal even when there's only one enemy.. that shouldn't happen. It shouldn't chain hit a single enemy multiple times.. Also it lags like crazy starting near grade 25, another good signal that it doesn't work right, everything else runs quite quickly.
no apparitions, specters, shadows, spires, or beacons toworry about but also and maybe unfortunately no mana shards spawn in them either. find a cave field and setup a triple layer line of mana leech + poolbound traps in front of each entrance (those swarmlings like to squeeze past small corners) and you can last forever in endurance with relative safety.
all skills accounted for, all possible fields clear but aside from the mysteries i pointed out before which i haven't any idea how to solve i now find myself missing something else. bottom right corner, what is that battle trait and where do you unlock it? (G4 perhaps?)
holy crap, an infinity gem infinity - infinity x infinity.woah, haven't seen one of those since labyrinth, impressive. shame endurance got nerfed somewhat from labyrinth, now its only 999 waves (or at least the field i finished it on was).