The Marker Pen's True Purpose

Caster stormed off in a huff. Not only did her new Master have a screw loose, he was also viciously sharp-tongued. Two out of every three sentences were insults aimed at her, while the third was for praising himself and putting her down along the way.

"A man with absolutely no grace. This is the first time I've ever met such a terrible person!" Caster gritted her teeth in fury. "And that dumb, wooden-headed idiot Lancelot actually put up with him until now. Knights really are hopelessly brutish fools."

Caster felt that she was not far from betraying Duke. It was not that she wanted to betray him; she was being forced into it. If she stayed by Duke's side much longer, she might become the first Servant to be angered to death.

No sooner said than done, Caster returned to her room, set up a sealed barrier, and took out her Noble Phantasm, Rule Breaker. It was an exquisitely crafted dagger, its sharply angled blade twisting like lightning and gleaming with a splendid luster beneath the light.

The Sword of Betrayal and Denial, a Noble Phantasm formed from the divinity of Medea, the Witch of Betrayal!

A dagger was a close-range weapon, but this beautiful weapon had attack power equivalent to zero when used for combat. Its greatest purpose was not attacking enemies, but releasing curses. It was the ultimate anti-magecraft Noble Phantasm.

Anything stabbed by Rule Breaker would have its magecraft cursed, resetting the state of its magecraft use. Simply put, it was like wiping a computer and reinstalling the system. Although it did not work on Noble Phantasms, when it came to magecraft, Rule Breaker was invincible!

In a Holy Grail War with its Servant system, Rule Breaker was a bug-like Noble Phantasm capable of easily severing