Board Thread:Questions and Answers/@comment-7066017-20150419172837/@comment-5398287-20150420010242

You mean Ultrafragor? We never saw it in any sort of canon or semi-canon (i.e. the anime) material, but Soul Resurreccion had them producing an exceedingly powerful explosion, like Fragor but contained within the rings. That's the best answer I can give you.