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[YanderePrincess]

When do you PERSONALLY use Manawall and/or Manaward, since the only scenarios you have listed were hearsay?

Only one scenario I listed was hearsay. I always use Manaward if I'm going to be converting during an unavoidable aoe, such as Titan stomps or Turn 2 enrage method. I also will generally use manaward during things like Titan/Garuda/Ifrit's signature move, airship drops in Ultima HM, or any other time I'm going to be taking a big magic damage hit.

Manawall is a little more situational because it's used against physical damage, though one thing that helps is learning which abilities are physical damage. There's a number of abilities that you might expect to be magic but are actually physical. A general rule of thumb I found from playing Dragoon is if it can be parried, it's physical.