Ok so this is the ability.
Rune of Fangs: These jagged runes cover the mystic's face, giving him a bestial expression. While polymorphed or otherwise transformed into a form with natural attacks, the mystic gains an enhancement bonus on his attack and damage rolls equal to 1/2 his level with one natural attack, chosen when he assumes that form. Each time he selects this tattoo, he can choose one additional natural attack to apply the bonus to.
The question is where it says "The mystic gains an enhancement bonus on his attack and damage rolls equal to 1/2 his level with one natural attack." Is it just your tattooed mystic levels or is it your entire character level?
Thanks for your help. Cheers.
tattooed mystic levels
PFRPG never assumes you are multi-classing
yup. class abilities will say 'character level' if they want to refer to your total character level. otherwise they are assumed to be referring to levels in the class itself. otherwise would result in huge duplication of boiler-plate text in every single class, even though the assumption is that a majority of builds are single class.