Strauss' Take Over ability allows her to utilize the powers of demons, and her Satan Soul grants her incredible strength and access to dark magic energy.
An eruption forces Mitty to flee, and as there is nothing left for him to do, he obeys a text message recalling him to New York.
Unfortunately, Mitty had interpreted this message as a direction to look inside the tissue paper in the box containing the wallet, and it could also be interpreted as referring to the inscription stamped into the leather inside the wallet.
The synopsis below may give away important plot points.
There are a ton of criticisms that can be levied at creator Hiro Mashima, but he definitely got as creative as possible with the mage variety: Dragon Slayers, Enchant Magic, Elemental Control, Tarot Cards, Possessions.