The potion is a green glass bottle with the word "acme" carved on it, and it has a cork top. Inside, is the glowing green liquid. With the cork removed, it releases sickly green flames and smoke in shape of snakes, and other sinister 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, it proved to have the Achilles' heel and to his ultimate downfall as 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 stores his potion in his cleavage 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 the hilt of the sword, finally merging it together. With Excalibur grafted to his arm, Ruber continues with his plan.
However, the potion's ultimate weakness is revealed to be Ruber's ultimate downfall when he accidentally sends Excalibur back into the stone after being tricked by Kayley and Garrett. The potion was eventually destroyed and removed from Excalibur and all of Ruber's henchman by the stone which also disintegrates Ruber into thin air.