User blog comment:AnonymousAK/Demon's Royale/@comment-25121709-20140715151833/@comment-7418318-20140715174042

Terra Clamae was only so strong because it used the magic of Tenroujuma as "fuel". In any other place it would most likely be much weaker.

And against Tartaros it wouldn't help because Franmalth could just absorb it, protecting everyone else and gaining a temporary boost on top of it.