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All of the creatures from the Fire floor are taken directly from Gurgu Volcano, and so unsurprisingly they aren't terribly difficult (which is nice since this floor has a number of Treasures you'll need to go searching for). The Grey Ws and R.GIANTS hit hard but go down easy to a high-level party. AGAMAS might annoy you with their moderate-damage HEAT attack, but Fire resistance should reduce the damage to a nominal amount. The real threats here are the rarer FIRE and Red D groups. Red Ds can really do a number on even a Fire-resistant party.