Arc Chain

The Arc Chain is a post-Plantera rare magic weapon obtained as a 2% (1 in 50) drop from Elementals during the Magickin Event.
Using the weapon causes it to fire streaks of lightning as projectiles in quick succession, piercing up to 4 enemies. Each time an enemy is hit by the bolt it arcs to two nearby enemies, dealing half the damage. In order to chain to enemies, the bolt can arc through small walls.