Within the vast King's Chamber, brightly colored mist spread like a fragrance, leaving anyone who saw it feeling refreshed and at ease.
Yet faced with this alluring mist, Jeanne and Mordred's expressions changed at the same time.
"Danger...!"
"Poison...!?"
The two Servants leaped backward almost reflexively.
However, that action was utterly meaningless.
"Bang!"
Behind them, the gate Mordred had just destroyed restored itself amid a ripple like a mirage. It slammed shut heavily, producing a loud crash.
"Buzz!"
At the same time, the surrounding space twisted, making the already vast King's Chamber seem infinitely large. Even though Jeanne and Mordred retreated at speeds akin to bullets, they did not shorten the distance to the gate at all.
Then, the poisonous mist swept forth like a gale, directly engulfing the entire space.
The deadly poison began invading Jeanne and Mordred's bodies.
"Urgh..."
A faint pain ran through Jeanne's body.
The effect of Goddess's Light equipped by Sylvia seemed to have activated, negating 80% of the damage.
"Tch..."
Mordred clicked her tongue.
"So this is that Poison Woman's Treasure Tool...!?"
—"Sikera Usum".
Semiramis's second Treasure Tool. In some respects, it took priority even over the Floating Garden. It was Semiramis's primary offensive Treasure Tool and proof of her status as the Oldest Poisoner.
This Treasure Tool could grant the property of "poison" to the surrounding environment, space, and even magecraft, allowing Semiramis to create any poison within the atmosphere. Anything she created with magecraft, even a tiny flame, would carry poison, ultimately turning the entire area into a world filled with deadly toxins.
In an ordinary Holy Grail War, Semiramis would use this Treasure Tool as her main means of battle, fully embodying her identity as a poisoner.
However, if she could summon the Floating Garden and use this Treasure Tool within