No, it changes in the middle of the game. Monster will start casting Silence, Slow, Sap, Confuse, Oil, Petrify, Blind and Poison status causing you to heal that. If you can't afford Esuna, you can use Poisona, Blindna, Vox, Stona, Regen, Haste and Dispel.
Having a bunch of spell that is not used yet is good. You can create more tactic/strategy.Originally Posted by Miriel
Slow and Haste are very useful. Haste act as a counter to Slow, while majority of the bosses/monsters are not immune to Slow. You have to use Haste, because some attacks from normal monster causes Slow. IF you are in critical state and your enemy are also in critical state, you can use Balance to inflict damage, Equipping Ruby Ring allow you to abuse Reflect effect, Immobilize and Disable are disaster when combine, if you are caught fighting with a lot of enemies, you can always use this to give some time for healing (Time Magicks). You can't attack flying enemies with normal attack, unless if you have long-ranged weapon, so you need to use Black Magicks, the best Black Magic can do quite a damage and hit all enemies, also reflectable, so Reflect do the tricks. If you're losing your MP, you can always use Syphon to absorbs MP, if enemies attack are too strong, you can use Bubble to double Max HP and Reverse to convert damage into healing (Arcane Magicks). White Magicks is savior, Cure/ra/ga/ja ensure your safety, Raise and Arise revive character. Dispel can be used to remove beneficial status. Regen can heal Sap, while Cleanse heal Disease, Esuna heals a lot of status. Whe fighting boss, Protect and Shell helps a lot, also Bravery and Faith. Some bosses are not immune to some status like Silence, Blind etc. so use them at full potential (Green Magicks). Technicks like Steal, Libra, Charge, Poach and Achilles is very useful, Addle, Shear, Wither and Expose act as Stat Breaks.