Elemental Overload

Elemental Overload is the Mastery for the Elemental tree, you need to select the Elemental Specialization to be able to train it.

Elemental Overload gives an Elemental Shaman a chance to proc an extra attack while casting Lightning Bolt, Chain Lightning or Lava Burst. This extra spell costs no mana and does not create any additional threat.

Procs of Lightning Bolt or Chain Lightning can generate Rolling Thunder charges.