What makes the limit break bar fill up?

[Nova_Dresden]

Bubble refers to Hallowed Ground.

It's called Bubble because it's essentially a copypasted ability from WoW that Paladins had at very low level, creating a golden bubble around themselves that made them impervious to all harm and mechanics for 8-12 seconds (depending on level). Its most notorious use was the ability to Bubble and then use your Hearthstone (10 seconds cast time) to teleport back to safety.

That said, Yoshi-P confirmed (not just in the recent newsletter) that a party that uses nothing but different jobs built its limit faster, and it's pretty easy to notice if you ever do it too.

Try getting a Coil group together that looks something like:

PLD WAR, SCH WHM, BLM BRD MNK DRG.

You'll notice how quickly the limit break bar shoots up compared to normal.

Hallowed Ground actually mimics Paladin's 2-hour from FFXI, Invincible. It made you take 0 damage from all physical attacks, but did not work on magic attacks. I've yet to see any damage get through Hallowed Ground, but the tooltip does say "most attacks". Most people think WoW when it comes to Bubble, but even that ability was a copy of other abilities from older games.

On topic: Interrupting any attack that can be interrupted and gives the red warning zone on the ground tends to give larger chunks of the bar as well. I try to stun as many of them on trash pulls up to the bosses for that reason alone.