Undead Nature

Prerequisite:a con score of 13 or more 

Through your constant interaction with the dead and undead, and your self experimentation you have become psudo-undead yourself.

Uncontrolled undead with a intelligence score below 10 see you as another undead and are unlikely to attack you. They will however defend themselves if you inflict a saving throw or hit them. They will also become hostile if a party member within 20ft does any similar action, your party members would still be attacked as normal.