Lightning Flood is a skill located in the Storm Calling (which can be found in the Sorcerer skill tree). Lightning Flood is a morph of Lightning Splash
Lightning Flood deals the following types of damage: Shock Damage. Which means that it gets buffed by the following blue champion point trees: Elemental Expert, Elf Born, Spell Erosion, Thaumaturge. Also the following red champion point trees protect against this skill: Elemental Defender, Thick Skinned.