Small Great Metastasis Fragment?


Hello! Returning DFO player here. I’m going through the Mirror Arad questline and I think I’ve gotten to the final quest “Return To Hendon Myre” where after I beat Lotus I have to go back to town and speak to Michelle. But before I can I have to collect 10 Small Great Metastasis Fragments and I only have nine. How do I get the final one? Please help!