NulAll Guard

NulAll Guard, also localized as Element Guard, is a recurring ability in Final Fantasy series.

Final Fantasy XIII-2
Element Guard is a Sentinel ability that enhances elemental resistance to all allies while defending.

It is learned by Serah at Role Level 10, Noel at Role Level 18, Bunkerbeast at level 36, Flandit at level 54, Goblin Chieftain at level 36, Lancer at level 17, Major Moblin at level 26, Metal Gigantuar at level 42, Pulsework Gladiator at level 30, Pulsework Knight at level 10, Snow at level 8, Tezcatlipoca at level 30, and Xolotl at level 30. Navidon knows it by default.

Lightning Returns: Final Fantasy XIII
NulAll Guard is a defensive ability that on top of reducing received damage by 25%, greatly enhances elemental resistance while defending.