Barthunder (status)

Barthunder, also known as NulShock, is a recurring status effect. It grants resistance against Lightning-elemental attacks. The most common ability that grants Barthunder is the spell of the same name, Barthunder.

Final Fantasy
NulShock reduces Lightning-elemental damage inflicted on all allies by 50%.

Final Fantasy X
The NulShock status on a character negates one Lightning-elemental attack or spell and is represented by a circling yellow orb. It can be granted by the NulShock spell and armor customized with SOS NulShock, which grants NulShock when the wearer reaches critical HP.

Final Fantasy XI
Barthunder increases the player's resistance to the Lightning-based elemental damage caused by spells, attacks, and status effects. The spells Barthunder and Barthundra, accessible by the Red Mage and White Mage respectively, can give the Barthunder status.

Final Fantasy XIII
Barthunder increases resistance to Lightning-elemental damage. Two accessories give Barthunder under certain conditions: the Sparkbane Brooch grants Critical: Barthunder, and the Sparkshield Earring grants Auto-Barthunder.