Slayer's fourth Ability, which corresponded to Orphne's Transcendent one, was simple at first sight. In fact, Sunny could have already guessed what it was, having seen it in the visions bestowed upon him by Ariel's Game.
It allowed her to take the shape of beasts she had seen, heard, smelled, touched, or whose flesh and blood she had tasted. She was a shapeshifter.
Such a Transformation Ability was certainly versatile, and could be a powerful weapon when faced with a certain kind of enemy… but that was not what piqued Sunny's interest.
Instead, it was the fact that Slayer was a being who had existed for thousands of years, and had therefore met and killed a great number of beasts — and the fact that the definition of "beasts" the runes described was quite vague. Their direct meaning was "bestial things", which was not exactly precise.
