About red magic... and more generally all other kind of magics

[Rongway]

the only element red mage does not use yet is water aspected element.

Red Magic was a joint invention from the few Amdapori White Mages and Mhachi Black Mages who survived the Flood. The War between Amdapor and Mhach caused the calamity but what made the calamity specifically a flood was that the land had a dangerous overabundance of water aether because the Amdapori White Mages didn't use water magic, and so Red Magic, being born of White and Black Magic, would be unlikely to include water. Fleche and Contre-Sixte are not water elemental.