Limit Breaking - General rules of?

[Garlyle]

In general, Melee LB has the highest priority. You also don't want to save it until the boss is already at 1-2% (Because a lot of that damage will be wasted in overkill) - use it as soon as it's full, and safe to, on a given boss. If there are no melee, Caster LB should be used. If the only DPS are bards, what the heck, do whatever.

When you advance onto later content, you'll be able to LB3 instead of LB2, and a big distinction is that healer's LB3 will immediately raise everyone, which other levels of LB won't. When this happens, you generally save melee DPS until the last 4-5%, at which point it's clear you'll clear - but until then LB3 is often saved for emergency saves.

Tank LB3 and Caster LB3 are also ideal for certain boss fights for various reasons, and a handful of advanced fights will use these LBs over the standard priority for very specific situations.

[Darwinian]

Ahhh, I see so they upgrade for higher level dungeons/harder modes? Good to know. To be honest, I've been a little afraid of banging in the LBs before time. Explains why people were getting frustrated with me if I'm sat on the LB seemingly scratching my butt with my lance haha. Helpful tips thanks

[LunaHoshino]

In general, Melee LB has the highest priority. You also don't want to save it until the boss is already at 1-2% (Because a lot of that damage will be wasted in overkill) - use it as soon as it's full, and safe to, on a given boss. If there are no melee, Caster LB should be used. If the only DPS are bards, what the heck, do whatever.

What Garlyle said. You really want to use it as soon as it's available (and safe to do so), because in some fights (especially endgame ones) it's possible to fill the LB gauge up more than once during the fight. The sooner you empty it, the sooner you can let it start building back up again and hopefully get another LB.