The potion is a green glass bottle with the word "acme" carved on it, and it has a cork top. It contains powerful green liquid that produces green flames and smoke in shape of snakes, and other sorts of spirits.
The potion is so magically powerful, that it can merge weapons to anyone, under several seconds, turning them into metal monsters. But after Ruber used his potion to meld Excalibur to his hand, The potion's magic and power does not mix very well with the stone where Excalibur came from, which destroys the potion, reversing the effects by removing the taint of the potion from Ruber's henchmen, and Excalibur before finally dissolving Ruber into thin air.
After Ruber and his henchmen broke into Julianna's home and abducted both Kayley and Lady Juliana. Ruber then reveals his potion from a box that he bought from some witches. he then demonstrates it by using a chicken and axe, he pours a few drops of the potion in a well, and throws the chicken and the axe into the well, becoming Bladebeak. Then Ruber's henchmen line up to get themselves turned into ironmen. Ruber keeps holds of his potion in order to use it for Excalibur as soon as he finds it.
Ruber uses his potion again, after he captures Kayley and eventually gets hold of Excalibur for the first time. He pours a drop on his hand and Excalibur, finally merging it together. With Excalibur grafted to his arm, Ruber continues with his plan.
However, The potion's weakness is revealed when Ruber accidentally sends Excalibur back into the stone after being tricked by Kayley and Garrett. The potion was eventually destroyed and removed from Excalibur by the stone which also disintegrates Ruber into thin air.