Nine-tailed mystics are kitsune with such volatile magical powers that they grow additional tails in order to contain it.
A nine-tailed mystic grows additional tails as his powers blossom, allowing him to unlock his inherent powers at the cost of spell lore. Each time the nine-tailed mystic would earn a bonus spell from her bloodline or mystery, she gains Magical Tail as a bonus feat instead. After she has selected Magical Tail eight times, she instead chooses one of her Magical Tail spell-like abilities and increases the number of times per day that she can cast it by one. She cannot select a spell-like ability more than once in this way. For an oracle, this ability replaces the oracle’s mystery spells. For a sorcerer, this ability replaces the sorcerer’s bloodline spells.
Kitsune Compendium © 2014, Everyman Gaming, LLC; Authors: Alexander Augunas.