One of the Arkentools.
Even without being attuned to the user, the Arkenpliers are a very powerful melee weapon. They are capable of disintegrating any uncroaked unit, regardless of strength and status, with a single hit.
Powers when Attuned
Just what enormities can be expected of Wanda attuned to the Arkenpliers are unclear, but given her vocation for Croakamancy, and given that that school is the aspect of Naughtymancy ruled by the aspect of Fate, it would seem that a powerful artifact of fate in her hands is something to be feared.
Real World References
It was pointed out that a company named Zhejiang Wanda Tools Co. Ltd specializes in making pliers.