Dust of Osiris

Dust of Osiris is the all-purpose Mystic Code that Rani develops for you to use in your battle against Passionlip.
You use this in order to avoid instant death from Lip’s cube compression attack. This Mystic Code is a raging sand storm that blocks anything that would try to affect/change your status.
As to why it has the name “Osiris,” please refer to the last boss of the fighting game Melty Blood Actress Again.
It blocks Green Archer’s poison, and even Karna’s meteorite attack.
What is the point of having Aromatic Wood of Healing, when Rani-san alone is good enough, right?

Fate/EXTRA Material: Encyclopedia of Fate/EXTRA