Acronym: OSA

What it actually stands for: Office of Students' Affairs, a department in NUS.

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In the story, it stands for: Occam's Shield of Attrition

- a powerful magical shield consisting of rapidly revolving veils that surrounds its subject. Whatever touches it, be it matter or energy, is instantly absorbed and the energy converted as source for the shield, strengthening it.

- First appears in Chapter 50, surrounding Sion.

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