Rudra reached the top of the mage tower as he used Excalibur's size expansion to use his full might and chop the black crystal in half.
Rudra expected a loud clang , or a great resistance when his sword came in contact with the black crystal however instead the moment Excalibur's edge came into contact with the black crystal , it caught black fire , as within moments the dark gold grade sword was turned into a pool of metal.
Rudra was utterly stupefied , as he watched the destruction of his beloved sword with his own eyes , as he understood that the crystal was something that he should not mess with lightly , lest he suffer consequences.
However not one to give up on things he desperately wanted , Rudra decided to take the metal rod that was supporting the crystal out , and use that metal itself to hammer the crystal to break into smaller pieces.