The elemental damage bonus stacks additively, not multiplicatively with the one provided by items (such as Rainbow Facet, Eschuta's Temper or Griffon's Eye), somewhat diminishing their usability for a Sorceress.
It should be noted that the melee damage component of the Holy Shock aura provided by Dream will be affected by Lightning Mastery twice. First, the aura itself will have its damage augmented by the listed percentage. This means the aura's pulse will deal around 1-1k lightning damage per pulse. Then, the damage the aura adds to the Sorceress's attacks will be increased by the listed percentage again when she Attacks. This is how dual-Dream Sorceresses manage to deal 1-30k+ lightning damage with each swing.
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