A ring that slightly reduces any thunder damage sustained by the wearer. The stone residing in its center evokes the image of a flashing bolt of lightning, and it has the ability to weaken the power of thunder. However, it cannot completely protect the wearer from thunder attacks, nor absorb their energy. Although some believe that wearing the spark ring will help them avoid being struck by lightning, it unfortunately has no such effect.
Lightning Ring (雷の指輪, Kaminari no Yubiwa?), also known as Thunder Ring, NulShock Ring, Bolt Ring, Spark Ring, and Yellow Ring, is a recurring accessory in the series. It either absorbs or nullifies the Lightning element to the user.
Bolt Ring is an accessory that nullifies Lightning-elemental damage to the user. It can be bought for 8,000 gil at Mideel or received from the Sleeping Man near a cave by Junon when the last two digits of the player's battle numbers are 22, 44, 66, or 88.
Yellow Ring is an accessory that provides +4 Magic, allows the user to cast Thunder, and halves Lightning-elemental damage taken. In addition, two can be used to teach a creature Lightning Ward. It can be bought for 3,000 gil at Thunder Plains (all Chapters except 4), found at Floating Ruins (Chapter 1), dropped from Behemoth (Normal; rare and Oversoul), stealing it from Protochimera (rare), Bolt Drake (rare), and Pairika (rare), bribed from Gold Elemental (Normal; rare and Oversoul; 1,584 gil), as a possible prize for recalibrating the Thunder Plains towers, or for dispatching a level 2 Chocobo to Thunder Plains.
Lightning is a sudden electrostatic discharge during an electrical storm between electrically charged regions of a cloud (called intra-cloud lightning or IC), between that cloud and another cloud (CC lightning), or between a cloud and the ground (CG lightning).
Thunder is the sound caused by lightning. Depending on the distance and nature of the lightning, thunder can range from a sharp, loud crack to a long, low rumble (brontide).