Avan
Second comment: regarding his passion for the Metamorph theory, his Photosynthesis spell should me much stronger now that he also has the Light element (previously the Grand Magus of the Plant Institute told him that Light was missing for a powerful effect). Since he also has the Dark element, he should be able now to create a live plant from the mushroom spore he was not successful previously. Also the Fire attuned seed he also tried, with the strongest photosynthesis spell, can he make it work? Maybe ask Julian or Thrax for help with Fire? Diversifying his helpers will probably be a good thing.
a couple of comments since I forgot to comment previous chapters. Although Emery sound powerful, he seems to be a bit to much a "cultivator type character", and missing magic. Yes the Dao Matter spell is strong, but he basically only have that powerful "magic bullet". He has defensive skills, support ones, but he is missing more explosive skills. He doesn't have a powerful AoE, or rapid and powerful ranged spells. Also both Kleo and Magus Sheena told him about the effect learning spells has on comprehension of elements, so why is he not buying the all cheap and low level spells for ALL his elements? By better understanding an element we could create his own spells and combinations (like he did for the "Jade" series of spells). With 5 elements, combinations spells should be his trump cards.