Assize

[Saseal]

I'm sort of baffled by this, considering it's an all-in-one move.

What's the best use for this? For damage or the "free" Medica? Or is it dependent on situation?

I've used it both in and out of Cleric but I feel like I'm missing something every time I use it.

Definately situational. Clericed = high AoE damage, non-clericed = high group heal.
It holds the same Yin-Yang thing that WHM's seem to have - high burst offense (dps) OR high burst defense (heals).

-For ex, in Trials and bosses I tend to save Assize for group healing unless I'm wholey confident in myself and the team that I won't need it. I'll use it as a free, emergency, completely instant medica. Also when I've mis-timed a moment needing to pre-cast Medica/II or Cure III and pop it right as the damage is taken on the party to make up for it.

-If there's lots of monsters/mobs, no one needs heals or it's a total DPS race (Bismark), I'll throw it with Cleric for the sake of damage (or Bismark instance, use it on the chiton between PoMed Stone IIIs, and use a divine sealed + SCed Medica II just before jumping on his back as a method of healing for the wind DoT). As someone mentioned, I also use for the feathers in Neverreap, as well as the flame balls of the last boss in Vault. Doesn't outright kill them, but does take a good chunk out of a lot of them.

-In cases of MP need, I'll use it in the instance that Shrouds is down and I'm nearly OOM or 45% and below. People may not need healing and it's too dangerous to switch to Cleric for damage with that CD timer... but if I randomly pop un-clericed Assize without healing need, it was probably for a tidbit of MP for whatever reason I see.