Barthunder (バサンダ, Basanda?), 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.
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 HP Critical HP.
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.