Mangekyo Sharingan

You have awakened the sharingan to its ultimate form

Your perception and reaction speed are drastically increased 

• You gain a +8 bonus to initiative.
• You can't be surprised while you are conscious.
• Other creatures don’t gain advantage on attack rolls against you as a result of being unseen by you.
• You are able to take a reaction on each turn in combat
• You are able to attempt to copy and cast spells being cast by a enemy against you that you can see without using spell slots as a reaction for use on the next turn by making a perception check with the DC being 15 plus the spells level using this ability will give you a level of exhaustion for each use after the first in combat
• Gain expertise in perception (must be manually changed by dm)
• Able to use a action to cast a powerful genjustu on a target that looks at your eyes at the cost of 1 exhaustion point with each use: A target in a genjustu is stunned until they make a successful con save dc 18 taking 5 d10 psychic damage at the end of each round untill free you may release this genjutsu at will 
• If user is a class that is able to cast spells they may take spells such as amaterasu,Izanagi,and susanno and tsukuyomi and add them to there spellbook replacing other spells with them if needed