the ones in the Earth Challenge area? each one needs a different strategy. the one with the whip has a tell where you dont want to attack or she will counter with an attack that can team wipe you if you are unlucky, mature looking one uses a drain spell that takes your MP and attack you with spells that can team wipe you if you are unlucky so its best to go into that one with 0 MP, and the one with the armor is a 2 stage fight but i forgot the strategy for that one.