Thunderstorm

Thunderstorm is a post-Moon Lord magic gun that drops from Storm Weaver. It is the rare variant of the Plasma Rifle. When used it will fire a stream of green plasma bullets that explode upon contact with blocks or enemies. Each explosion causes five smaller plasma bullets to rain down within the vicinity of the explosion. Each smaller plasma bullet will do full damage and will pass through blocks for a few seconds. A decorative green circle is also created by the explosion.

Trivia

 * This weapon is a reference to the Storm sniper rifle from Borderlands 2.
 * Prior to the 1.4.5.006 update, it dropped from Cloud Elementals after Providence, the Profaned Goddess had been defeated.