While unattuned and owned by Prince Ansom, the Arkenpliers were a powerful weapon, capable of instantly destroying most Uncroaked units on contact, as well as being able to hurt other Units.Erf-b1-p022Erf-b1-p071Erf-b1-p118
The Arkenpliers had been held by Jetstone for a long time before King Slately decided to allow Prince Ansom to use them in the Battle for Gobwin Knob. However, at that time, the Arkenpliers were not attuned to him.Erf-b1-p022 One major reason why King Slately took the risk of giving them to Ansom was his hope that Ansom would become attuned to the pliers in the course of battle. After Ansom's deathErf-b1-p131, the Arkenpliers were briefly recovered by Lady Sylvia Lazarus of the Royal Crown CoalitionErf-b1-p132, only to be lost once again when the uncroaked volcano wiped out all Royal Crown Coalition forces inside Gobwin Knob.
Wanda Firebaugh recovered the Arkenpliers from the ruins of Gobwin Knob after the battle and attuned to themErf-b1-p142 in the culmination of a long questErf-b1-p143 to fulfill a Prediction about her attuning to an Arkentool. She used them to decrypt Prince Ansom and much of the RCC forces destroyed in the explosion.
Powers when Attuned
The 'pliers allow the Wanda to decrypt corpses as new units on her side. Since the decrypted do not degrade over time as a normal Uncroaked would, this allows her to create a nearly unstoppable army. Every time Wanda wins a battle, she decrypts the corpses of the enemy, giving her an even larger advantage in the next battle.
It is unclear what other powers, if any, Wanda has gained from her attunement. Given that Croakamancy is the aspect of Naughtymancy ruled by Fate, it would seem that it is a powerful artifact of Fate in her hands and the pair are something to be feared, even by Stanley the Tool. Wanda is capable of Fate magic in disciplines outside of Croakamancy, so those spells might also be enhanced by the Arkenpliers.
Real World References
It was pointed out that a company named Zhejiang Wanda Tools Co. Ltd specializes in making pliers. Or at least it used to - the website now points to a software company.