Mystic Orb is a skill located in the Undaunted (which can be found in the Guild skill tree). Mystic Orb is a morph of Necrotic Orb
Mystic Orb deals the following types of damage: Magic Damage. Which means that it gets buffed by the following blue champion point trees: Elemental Expert, Elf Born, Spell Erosion. Also the following red champion point trees protect against this skill: Elemental Defender.