Loss of disguise

Once a day, a Rakshasa is able to drop their human visage at will and assume their true form. Returning to their true form turns the Rakshasa into a medium creature. Those who witness a Rakshasa's change must pass a constitution saving throw or become frightened. One use of the spell Alter Self can return a Rakshasa to its humanoid disguise, effectively ending the feat
A Rakshasa also gets access to its natural weapon. (Its claws)