Thundercaller

The Thundercaller is a sword added by Botania. It uses Mana from a Mana Tablet or any other Mana providing item in the player's inventory to prevent item damage or repair itself, using 60 Mana per point of durability. It deals points of damage on attack.

When a creature is attacked with this sword, a weak chain lightning attack will deal points of damage to a random monster in an 8 block radius, then jump to a next target in the same range around the previous one, dealing  less point in damage. This is repeated until 4 enemies are damaged.

Trivia

 * This weapon is a reference to the World of Warcraft weapon, the Thunderfury, Blessed Blade of the Windseeker.