Three Tomoe sharingan

You have awakened the sharingan to Three tomoe 

Your perception and reaction speed are drastically increased 

• You gain a +5 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 18 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)