Last Bastion

Last Bastion is a Level 3 Limit Break currently available to Paladins and Warriors. It grants the entire party a damage reduction of 50% for ten seconds, and consumes all three limit break bars.

Final Fantasy XIV
When the limit break is executed, the Paladin or Warrior roots in place, and pulls up four massive pillars from the ground. They then spread their arms wide, as if pulling open a set of double doors, and heavy walls form between the pillars.

(Note: This is simply an animation. The party will receive the buff even if they are not technically behind the wall.)

Etymology
A bastion is a heavy fortification that is built in such a way as to allow defense from multiple angles. In this case, Last Bastion is the last line of damage reduction a Paladin or Warrior can offer the party, consuming a Level 3 Limit Break.