Missions do drop it, but you already completed those if you only need the TH trophy. I got myself in the same situation actually lol. Lacking Ice and Thunder ring and don't have the charms to dismantle them from. So if anybody has a mob that drops it: hook us up! XD
Edit: going through the mob list in the guide, don't see a mob that drops it >.>
It needs to be on you all or have been on you all when you speak to Bakti on that save right? So even if I started up an old save who can get access to those rings I'd still have to get every other goddamn item on that save too? XD
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