Trap
The moment Alice's Castle of Eternal Ice manifested in the center of the ancient capital, Violet and the other Lord figured that they had to go all out, otherwise, they might not only fail their mission but die as well.
Failure was still acceptable. They could try capturing Michael once again at a later point in time. However, death was permanent. Neither Violet nor Beast, or the Lord of the Energy Seal wanted to die.
Violet retrieved dozens of Common Energy Stones and crushed them into pieces, resulting in a burst of energy to flood the surroundings. The Reverse Energy Seal placed on her sucked in a tremendous amount of the compressed, purified energy, allowing her to relieve the Storm of Bladed Strings with several thousands violet strings. She then added a Legacy Technique to further reinforce the power of her Soultrait. As a result, the bladed strings cut deep into the Castle of Eternal ice, slowly breaking the structure apart.