Shadow Eye

Shadow Eye is one of Shulk's supporting arts in Xenoblade Chronicles. It reduces Shulk's current total aggro, but do not affect the aggro gain after its use, it also gives him a Physical Arts Plus buff and increase the damage of his physical arts by 50% for the five next seconds. The amount of aggro reduced depends on the art's level.

Intermediate
The intermediate books are only found in shops for 6400 G
 * Bionis' Leg
 * Refugee Camp Shop

Advanced
Advanced art books are only available from enemy drops.