Board Thread:Questions and Answers/@comment-26257973-20150622222222/@comment-26021614-20150623201338

Tridon is generally not a good match for Fire-type opponents because of his Earth shield, which means no matter how good your team's defense, the fire-type attacks will penetrate right through it since the shield has defense of its own, and the final attack that breaks the shield will penetrate your unit's defense as well, leading you to cope only with high HP to defend yourself.

If you're going to the defensive route, try a double Kanon lead. Even Ogura fends better against fire-types than Tridon. Until SBS gets 7*, I would avoid using them anymore since there are better units.