Six Eyes

A Six Eyes bearer has immense perception and unrivaled visual prowess far beyond that of any other person. Their eyesight is comparable to high-definition infrared camera, allowing them to see even when their eyes are covered. They can easily see things from several kilometers away and distinctly tell apart different figures within that range
Their Eyes can see the Flow Of Mana and Cursed Energy
Their Eyes can also see other Peoples Powers/Stats/Innate Cursed Techniques
Their Eyes can also find Weak Points
Using This Power too often will cause very painful headaches
Their Eyes can also read enchantments
Axel is constantly under the effects similar to the Foresight Spell. Additionally, he has advantage on perception and Investigation checks.
The Six Eyes also has a 90% Cursed Energy cost reduction
This also gives the User a GREAT level of Control over their own Cursed Energy [Which also reduces the chance of landing a Black Flash STUPIDLY]