Version 1[]
Agatha cobbled this together for Martellus von Blitzengaard to replace the hand he amputated after a late member ✣ of the Smoke Knights, The Blonde Question, jabbed a poison coated blade into his thumb. Here ✣ he is seen in his secret chamber of The Refuge of Storms trying to recover from Agatha's hand job. It seems that it has the ability to absorb and redirect lightning, at least the voltage produced by Gil's stick, though this destroyed the hand which had been unable to fully protect its owner.
Version 2[]
Tweedle has had the hand replaced ✣ with a full four fingered version.
Version 3[]
After catching up with Agatha in England, the hand appears ✣ to have been replaced with an organic one/covered with skin (which is slightly paler than Tweedle's normal skin tone). It remains to be seen whether it still has special abilities.